磁性薄膜的光诱导超快自旋动力学研究
摘要
由于超快自旋动力学在基础研究和技术应用上的重要性,人们做了大量的实验和理论研究。然而,超快退磁过程的机制到目前为止还没有研究清楚。基于磁光克尔效应的时间分辨的泵浦—探测技术可以用来研究磁性材料自旋瞬态翻转的特性和磁性体系中磁化翻转的速度极限。本论文选择了几个特殊的磁性系统作为研究对象,深入研究了瞬态退磁过程和磁化恢复过程的机制。
本论文主要包含以下几个内容:
第一,我们研究了TbFeCo和TbFe合金薄膜的超快自旋动力学过程。首先,对于特定的TbFeCo薄膜,在低泵浦能量下,退磁只有一个阶段,退磁时间约为600飞秒。退磁时间增加随着泵浦能量的增加而增加,动力学退磁过程逐渐分为两个阶段,即快退磁阶段和慢退磁阶段。其次,在特定的泵浦能量下(1.0 mJ/cm~2),对于含Tb量低的样品,其瞬态退磁过程中只有快退磁阶段,并且退磁过程在600飞秒内完成。当Tb含量为21%时,快退磁阶段(持续时间约为600飞秒)结束后,出现慢退磁阶段,且慢退磁阶段的退磁时间达到最大值3.0皮秒。我们在TbFe薄膜中也发现相同的现象。最后,我们还研究对比了TbFeCo薄膜制备态与退火后的超快退磁过程,发现退火后退磁时间减小,这是由于退火可以减小磁致伸缩系数。结果表明,TbFeCo的巨磁致伸缩效应至少是造成退磁过程产生第二个慢退磁阶段和长退磁时间的重要原因之一。
第二,我们研究了不同散热层(包括Ag,Cu,Pt,Ta和Cr)的FeCo薄膜的超快自旋动力学过程。首先,对于不同散热层材料和厚度的样品,瞬态退磁过程都是在大约500飞秒以内完成,所以退磁时间与散热层和泵浦能量无关。其次,对于单层的FeCo薄膜,在延迟时间为4.0皮秒时的磁化强度与最大退磁量的比值(简称磁化强度的恢复率)比有散热层样品的降低了约15%。我们还发现磁化强度的恢复率与散热层材料密切相关,且随着泵浦能量的增加而降低。在我们研究的散热层材料中,Cr散热层的样品具有最大的磁化强度恢复率,这是由于FeCo层和Cr层晶格失配度很小,从而促成了FeCo层在散热层上柱状生长,因此减小了电子和声子在界面的散射,并且增强了热传导效率。经过分析,我们还发现在皮秒量级时间内的磁化强度恢复率与散热层的厚度和热导率无直接关系。最后,我们研究了超快激光的损伤阈值,发现散热层的熔点越高,其损伤阈值越高。在以上研究的所有样品中,Ta具有最高的激光损伤阈值。实验中还发现退火也能提高散热层的热传导效率及激光损伤阈值。
第三,我们选择FePt/CoFe复合双层膜结构为研究体系,研究其超快自旋动力学过程。实验中,我们发现瞬态克尔迴线出现两个翻转阶段,这是由于激光瞬态热效应破坏了FePt层与CoFe层之间的界面交换耦合,随着延迟时间增加到10-20皮秒,磁化翻转又出现类似于单层膜的一致转动。通过分析FePt与CoFe时间相关的磁化强度的比值,我们推断解耦合以及恢复缓慢的磁化强度归因于光诱导FePt层的自旋有序度的下降,并且界面交换耦合的重新建立归因于自旋—晶格弛豫过程。在实验中,我们还得到了研究光调制退耦合现象较合适的软磁层厚度。
Extensive experimental and theoretical studies have been carried out in photo-induced ultrafast spin dynamics because of its importance in both science and technology.However,the mechanism of the ultrafast demagnetization process has not been clarified yet.An optical pump probe with MOKE(magnetic optical Kerr effect) capability is used to investigate the ultra-fast demagnetization phenomenon.In the research work here,several magnetic systems are chosen to study ultrafast spin dynamics.The dissertation mainly includes the following contents.
Firstly,ultrafast spin dynamics in TbFeCo and TbFe alloy films is studied as a function of the Tb content and pumping fluence.For specific TbFeCo film with low fluences,the ultrafast demagnetization process only consists of one fast stage with the demagnetization time of about 500 fs.As the pumping fluence is enhanced,a slow stage occurs,in addition to the fast stage,and the demagnetization time is increased. At a fixed pumping fluence of 1.0 mJ/cm~2,only the fast stage occurs and the demagnetization time is as short as about 500 fs for low Tb contents.At 21%Tb,the fast and slow stages occur and the demagnetization time reaches a maximum of 3.0 ps. Similar results are also observed for TbFe film.The long demagnetization time is suggested to arise from the giant magnetostriction effect in Tb-based fills.After post-annealing,the demagnetization time is reduced due to a reduction of the magnetostriction coefficient.
Secondly,for FeCo alloy thin films with Ag,Cu,Pt,Ta,and Cr as heat sink layers,ultrafast demagnetization and recovery processes of transient magnetization have been studied by time-resolved magneto-optical Kerr effect.For all samples,the ultrafast demagnetization process is accomplished within almost the same time interval of 500 fs,which is independent of materials of heat sink layers and pump fluences.With heat sink layers,the recovery rate is enhanced,compared with that of FeCo grown on Si(100) substrate.It is also found that the recovery rate is independent of heat sink layer thickness and decreases with increasing pump fluence.Among all heat sink layers,the sample with Cr layer achieves the highest recovery rate because of the same BCC structure as FeCo layer and small lattice mismatch.For sample with Ta layer,it has the largest damage threshold of pump fluence because of the highest melting point.
Thirdly,photo-induced magnetization dynamics in FePt/CoFe bilayer is investigated by optical pump-probe measurements.The transient Kerr loops exhibit an instantaneous separated switching behavior due to exchange decoupling between FePt and CoFe layers induced by photoexcitation,which subsequently recover to the original uniform switching at a certain delay time of 10-20 picoseconds.By analyzing the temporal dependence of magnetization ratio of FePt to CoFe and coercivity of FePt phase,we infer that the decoupling and slow magnetization recovery phenomena are ascribed to the laser-created spin disordering mainly in FePt layer,while the following onset of interfacial coupling results from spin/lattice cooling process.In the study,we also found the proper thickness of CoFe layer to investigate transient decoupling phenomena.
本论文主要包含以下几个内容:
第一,我们研究了TbFeCo和TbFe合金薄膜的超快自旋动力学过程。首先,对于特定的TbFeCo薄膜,在低泵浦能量下,退磁只有一个阶段,退磁时间约为600飞秒。退磁时间增加随着泵浦能量的增加而增加,动力学退磁过程逐渐分为两个阶段,即快退磁阶段和慢退磁阶段。其次,在特定的泵浦能量下(1.0 mJ/cm~2),对于含Tb量低的样品,其瞬态退磁过程中只有快退磁阶段,并且退磁过程在600飞秒内完成。当Tb含量为21%时,快退磁阶段(持续时间约为600飞秒)结束后,出现慢退磁阶段,且慢退磁阶段的退磁时间达到最大值3.0皮秒。我们在TbFe薄膜中也发现相同的现象。最后,我们还研究对比了TbFeCo薄膜制备态与退火后的超快退磁过程,发现退火后退磁时间减小,这是由于退火可以减小磁致伸缩系数。结果表明,TbFeCo的巨磁致伸缩效应至少是造成退磁过程产生第二个慢退磁阶段和长退磁时间的重要原因之一。
第二,我们研究了不同散热层(包括Ag,Cu,Pt,Ta和Cr)的FeCo薄膜的超快自旋动力学过程。首先,对于不同散热层材料和厚度的样品,瞬态退磁过程都是在大约500飞秒以内完成,所以退磁时间与散热层和泵浦能量无关。其次,对于单层的FeCo薄膜,在延迟时间为4.0皮秒时的磁化强度与最大退磁量的比值(简称磁化强度的恢复率)比有散热层样品的降低了约15%。我们还发现磁化强度的恢复率与散热层材料密切相关,且随着泵浦能量的增加而降低。在我们研究的散热层材料中,Cr散热层的样品具有最大的磁化强度恢复率,这是由于FeCo层和Cr层晶格失配度很小,从而促成了FeCo层在散热层上柱状生长,因此减小了电子和声子在界面的散射,并且增强了热传导效率。经过分析,我们还发现在皮秒量级时间内的磁化强度恢复率与散热层的厚度和热导率无直接关系。最后,我们研究了超快激光的损伤阈值,发现散热层的熔点越高,其损伤阈值越高。在以上研究的所有样品中,Ta具有最高的激光损伤阈值。实验中还发现退火也能提高散热层的热传导效率及激光损伤阈值。
第三,我们选择FePt/CoFe复合双层膜结构为研究体系,研究其超快自旋动力学过程。实验中,我们发现瞬态克尔迴线出现两个翻转阶段,这是由于激光瞬态热效应破坏了FePt层与CoFe层之间的界面交换耦合,随着延迟时间增加到10-20皮秒,磁化翻转又出现类似于单层膜的一致转动。通过分析FePt与CoFe时间相关的磁化强度的比值,我们推断解耦合以及恢复缓慢的磁化强度归因于光诱导FePt层的自旋有序度的下降,并且界面交换耦合的重新建立归因于自旋—晶格弛豫过程。在实验中,我们还得到了研究光调制退耦合现象较合适的软磁层厚度。
Extensive experimental and theoretical studies have been carried out in photo-induced ultrafast spin dynamics because of its importance in both science and technology.However,the mechanism of the ultrafast demagnetization process has not been clarified yet.An optical pump probe with MOKE(magnetic optical Kerr effect) capability is used to investigate the ultra-fast demagnetization phenomenon.In the research work here,several magnetic systems are chosen to study ultrafast spin dynamics.The dissertation mainly includes the following contents.
Firstly,ultrafast spin dynamics in TbFeCo and TbFe alloy films is studied as a function of the Tb content and pumping fluence.For specific TbFeCo film with low fluences,the ultrafast demagnetization process only consists of one fast stage with the demagnetization time of about 500 fs.As the pumping fluence is enhanced,a slow stage occurs,in addition to the fast stage,and the demagnetization time is increased. At a fixed pumping fluence of 1.0 mJ/cm~2,only the fast stage occurs and the demagnetization time is as short as about 500 fs for low Tb contents.At 21%Tb,the fast and slow stages occur and the demagnetization time reaches a maximum of 3.0 ps. Similar results are also observed for TbFe film.The long demagnetization time is suggested to arise from the giant magnetostriction effect in Tb-based fills.After post-annealing,the demagnetization time is reduced due to a reduction of the magnetostriction coefficient.
Secondly,for FeCo alloy thin films with Ag,Cu,Pt,Ta,and Cr as heat sink layers,ultrafast demagnetization and recovery processes of transient magnetization have been studied by time-resolved magneto-optical Kerr effect.For all samples,the ultrafast demagnetization process is accomplished within almost the same time interval of 500 fs,which is independent of materials of heat sink layers and pump fluences.With heat sink layers,the recovery rate is enhanced,compared with that of FeCo grown on Si(100) substrate.It is also found that the recovery rate is independent of heat sink layer thickness and decreases with increasing pump fluence.Among all heat sink layers,the sample with Cr layer achieves the highest recovery rate because of the same BCC structure as FeCo layer and small lattice mismatch.For sample with Ta layer,it has the largest damage threshold of pump fluence because of the highest melting point.
Thirdly,photo-induced magnetization dynamics in FePt/CoFe bilayer is investigated by optical pump-probe measurements.The transient Kerr loops exhibit an instantaneous separated switching behavior due to exchange decoupling between FePt and CoFe layers induced by photoexcitation,which subsequently recover to the original uniform switching at a certain delay time of 10-20 picoseconds.By analyzing the temporal dependence of magnetization ratio of FePt to CoFe and coercivity of FePt phase,we infer that the decoupling and slow magnetization recovery phenomena are ascribed to the laser-created spin disordering mainly in FePt layer,while the following onset of interfacial coupling results from spin/lattice cooling process.In the study,we also found the proper thickness of CoFe layer to investigate transient decoupling phenomena.
引文
[1]M.Ledrmann,S.S chultz,and M.Ozaki.Measurement of the Dynamics of the Magnetization Reversal in Individual Single-Domain Ferromagnetic Particles[J].Phys.Rev.Lett.,1994,73:1986.
[2]W.D.Doyle,L.He,and P.J.Flanders.Measurement of the Switching Speed Limit in High Coercivity Magnetic Media[J].IEEE Trans.Magn.,1993,29:3634.
[3]W.K.Hieber,A.Stankiewicz,and M.R.Freeeman.Direct Observation of Magnetic Relaxation in a Small PermaUoy Disk by Time-Resolved Scanning Kerr Microscopy[J].Phys.Rev.Lett.,1997,79:1134.
[4]T.J.Silva,C.S.Lee,T.M.Crawford,and C.T.Rogers.Inductive measurement of ultrafast magnetization dynamics in thin-film Permalloy[J].J.Appl.Phys.,1999,85:7849.
[5]R.H.Koch,J.G..Deak,D.W.Abraham,P.L.Trouilloud,R.A.Altman,Y.Lu,W.J.Gallagher,R.E.Scheuerlein,K.P.Roche,and S.S.P.Parkin.Magnetization Reversal in Micron-Sized Magnetic Thin Films[J].Phys.Rev.Lett.,1998,81:4512.
[6]J.J.Baumberg,S.A.Crooker,D.D.Awschalom,N.Samarth,H.Luo,and J.K.Furdyna.Ultrafast Faraday spectroscopy in magnetic semiconductor quantum structures[J].Phys.Rev.B,1994,50:7689-7700.
[7]A.Y.Elezabbi,and M.R.Freeman.Ultrafast magneto-optic sampling of picosecond current pulses[J].Appl.Phys.Lett.,1996,68:3546-3548.
[8]A.Y.Elezzabi,M.R.Freeman,and M.Johnson.Direct measurement of the conduction electron spin-lattice relaxation time T_1 in gold[J].Phys.Rev.Lett.,1996,77:3220-3223.
[9]W.K.Hiebert,A.Stankiewicz,and M.R.Freeman.Direct observation of magnetic relaxation in a small Permalloy disk by time-resolved scanning Kerr microscopy[J].Phys.Rev.Lett.,1997,79:1134-1137.
[10]H.C.Siegmann,E.L.Garwin,C.Y.Prescott,J.Heidmann,D.Mauri,D.Weller,R.Allenspach,and W.Weber.Magnetism with picosecond.eld pulses[J].J.Magn.Magn.Mater.,1995,151:L8-L12.
[11]G L.Eesley.Observation of Nonequilibrium Electron Heating in Copper[J].Phys.Rev.Lett.,1983,51:2140.
[12]J.G.Fujimoto,J.M.Liu,E.P.Ippen,and N.Bloembergen.Femtosecond Laser Interaction with Metallic Tungsten and Nonequilibrium Electron and Lattice Temperatures[J].Phys.Rev.Lett.,1984,53:1837.
[13]E.Beaurepaire,J.C.Merle,A.Daunois,and J.Y.Bigot.Ultrafast spin dynamics in ferromagnetic nickel[J].Phys.Rev.Lett.,1996,76:4250-4253.
[14]J.M.Kikkawa and D.D.Awschalom.All-optical magnetic resonance in semiconductors[J].Science,2000,287:473-476.
[15]J.A.Gupta,R.Knobel,N.Samarth,and D.D.Awschalom.Ultrafast manipulation of electron spin coherence[J].Science,2001,292:2458-2461.
[16]G.Ju,A.Vertikov,A.V.Nurmikko,C.Canady,G.Xiao,R.F.C.Farrow,and A.Cebollada.Ultrafast nonequilibrium spin dynamics in a ferromagnetic thin film[J].Phys.Rev.B,1998,57:R700-R703.
[17]T.Kampfrath,R.G.Ulbrich,F.Leuenberger,M.Munzenberg,B.Sass and W.Felsch.Ultrafast magneto-optical response of iron thin films[J].Phys.Rev.B,2002,65:104429-1-6.
[18]J.Y.Bigot.Femtosecond magneto-optical processes in metals[J].C.R.Acad.Sci.,2001,2:1483-1504.
[19]Bloch F.Nuclear Induction[J].Phys.Rev.1946,70,460.
[20]L.Landau,and L.Lifshitz.On the theory of the dispersion of magnetic permeability in ferromagnetic bodies[J].Phys.Z.Sowjetunion,1935,8:153.
[21]T.L.Gilbert.A Lagrangian Formulation of the Gyromagnetic Equation of the Magnetization Field[J].Phys.Rev.,1935,100:1243.
[22]J.Ferre,V.Grolier,P.Meyer,S.Lemerle,A.Maziewski,E.Stefanowicz,S.V. Tarasenko,V.V.Tarasenko,M.Kisielewski,and D.Renard.Magnetization-reversal processes in an ultrathin Co/Au film[J].Phys.Rev.B,1997,55:15092.
[23]B.Hillebrands,and K.Ounadjela(Eds.).Spin Dynamics in Confined Magnetic Structures Ⅱ[M].Topics Appl.Phys.2003,87:253-320.
[24]R.Knorren,K.H.Bennemann,R.Burgermeister,and M.Aeschlimann.Dynamics of excited electrons in copper and ferromagnetic transition metals:Theory and experiment[J].Phys.Rev.B,2000,61:9427-9440.
[25]W.S.Fann,R.Storz,H.W.K.Tom,and J.Bokor.Electron thermalization in gold[J].Phys.Rev.B,1992,46:13592-13595.
[26]C.K.Sun,F.Vallee,L.H.Acioli,E.P.Ippen,and J.G.Fulimoto.Femtosecondtunable measurement of electron thermalization in gold[J].Phys.Rev.B,1994,50:15337.
[27]R.G.H.Groeneveld,R.Sprik,and A.Lagendijk.Femtoseeond spectroscopy of electron-electron and electron-phonon energy relaxation in Ag and Au[J].Phys.Rev.B,1995,51:11433.
[28]B.Sinkovic,L.H.Tjeng,N.B.Brookes,J.B.Goedkoop,R.Hesper,E.Pellegrin,F.M.F.de Groot,S.Altieri,S.L.Hulbert,E.Shekel,and G.A.Sawatzky.Local Electronic and Magnetic Structure of Ni below and above TC:A spin-resolved circularly polarized resonant photoemission study[J].Phys.Rev.Lett.,1997,79:3510-3513.
[29]T.J.Kreutz,T.Greber,P.Aebi,and J.Osterwalder.Temperature-dependent electronic structure of nickel metal[J].Phys.Rev.B,1998,58:1300-1317.
[30]M.Farle.Ferromagnetic resonance of ultrathin metallic layers[J].Prog.Rep.Phys.,1998,61:755-826.
[31]G.Ju,A.V.Nurmikko,R.F.C.Farrow,R.F.Marks,M.J.Carey,and B.A.Gurney.Coherent magnetization rotation by optical modulation in ferromagnetic /antiferromagnetic exchange-coupled bilayers[J].Phys.Rev.B,2000,62:1171-1177.
[32]G.Ju,A.V.Nurmikko,R.F.C.Farrow,R.F.Marks,M.J.Carey,and B.A.Gurney.Ultrafast optical modulation of an exchange biased ferromagnetic /antiferromagnetic bilayer[J].Phys.Rev.B,1998,58:R11857-R11860.
[33]M.B.Agranat,S.I.Ashikov,A.B.Granovskii,and G.I.Rukman.Interaction of picosecond laser pulses with the electron,spin and phonon subsystem of nickel[J].Sov.Phys.JETP,1984,59:804-806.
[34]A.Vaterlaus,T.Beutler,and F.Meier.Spin-lattice relaxation time of ferromagnetic gadolinium determined with time-resolved spin-polarized photoemission[J].Phys.Rev.Lett.,1991,67:3314-3317.
[35]A.Vaterlaus,T.Beutler,D.Guarisco,M.Lutz,and F.Meier.Spin-lattice relaxation in ferromagnets studied by time-resolved spin-polarized photoemission[J].Phys.Rev.B,1992,46:5280-5286.
[36]J.Hohlfeld,E.Matthias,R.Knorren,and K.H.Bennemann.Nonequilibrium magnetization dynamics of nickel[J].Phys.Rev.Lett.1997,78:4861-4864.
[37]J.Gudde,U.Conrad,V.Jahnke,J.Hohlfeld,and E.Matthias.Magnetization dynamics of Ni and Co.1ms on Cu(001) and of bulk nickel surfaces[J].Phys.Rev.B,1999,59:R6608-R6611.
[38]J.Hohlfeld,J.Gudde,U.Conrad,O.Duhr,G.Korn,and E.Matthias.Ultrafast magnetization dynamics of nickel[J].Appl.Phys.B,1999,68:505-510.
[39]A.Scholl,L.Baumgarten,R.Jacquemin,and W.Eberhardt.Ultrafast spin dynamics of ferromagnetic thin films observed by femtosecond spin-resolved two photon photemission[J].Phys.Rev.Lett.,1997,79:5146-5149.
[40]U.Conrad,J.Gudde,V.Jahnke,and E.Matthias.Ultrafast magnetization and electron dynamics of thin Ni and Co films on Cu(001) observed by time-resolved SHG[J].Appl.Phys.B,1999,68:511-517(1999).
[41]J.Hohlfeld.Utrafast electron-,lattice- and spin-dynamics in metals:Investigated by linear and nonlinear optical techniques[D].Ph.D.Thesis,Freie University,Berlin,1998.
[42]M.Aeschlimann,M.Bauer,S.Pawlik,W.Weber,R.Burgermeister,D.Oberli,and H.C.Siegmann.Ultrafast spin-dependent electron dynamics in fee Co[J].Phys.Rev.Lett.,1997,79:5158-5161.
[43]R.Knorren,K.H.Bennemann,R.Burgermeister,and M.Aeschlimann.Dynamics of excited electrons in copper and ferromagnetic transition metals:Theory and experiment[J].Phys.Rev.B,2000,61:9427-9440.
[44]E.Beaurepaire,M.Maret,V.Halte,J.C.Merle,A.Daunois,and J.Y.Bigot.Spin dynamics in CoPt3 alloy films:A magnetic phase transition in the femtosecond time scale[J].Phys.Rev.B,1998,58:12134-12137.
[45]J.Hohlfeld,T.Gerrits,M.Bilderbeek,T.Rasing,H.Awano,and N.Ohta.Fast magnetization reversal of GdFeCo induced by femtosecond laser pulses[J].Phys.Rev.B,2001,65:012413.
[46]G.Ju,A.Vertikov,A.V.Nurmikko,C.Canady,G.Xiao,R.F.C.Farrow,and A.Cebollada.Ultrafast nonequilibrium spin dynamics in a ferromagnetic thin film,Phys.Rev.B,1998,57:R700-R703.
[47]T.Kise,T.Ogasawara,M.Ashida,Y.Tomioka,Y.Tokura,and M.Kuwata-Gonokami.Ultrafast spin dynamics and critical behavior in half-metallic ferromagnet:Sr_2FeMoO_6[J].Phys.Rev.Lett.,2000,85:1986-1989.
[48]B.Koopmans,M.van Kampen,J.T.Kohlhepp,and W.J.M.de Jonge.Ultrafast magneto-optics in nickel;magnetism or optics?[J].Phys.Rev.Lett.,2000,85:844-847.
[49]B.Koopmans,M.van Kampen,J.T.Kohlhepp,and W.J.M.de Jonge.Experimental access to femtosecond spin dynamics[J].J.Phys.:Condens.Matt.,2002,14:1-14.
[50]H.Regensburger,R.Vollmer and J.Kirschner.Time-resolved magnetization induced second-harmonic generation from the Ni(110) surface[J].Phys.Rev.B,2000,61:14716-14719.
[51]B.Koopmans,M.van Kampen,J.T.Kohlhepp,and W.J.M.de Jonge.Femtosecond spin dynamics of epitaxial Cu(111)/Ni/Cu wedges[J].J.Appl.Phys.,2000,87:5070-5072.
[52]A.V.Kimel,A.Kirilyuk,P.A.Usachev,R.V.Pisarev,A.M.Balbashov,and Th.Rasing.Ultrafast non-thermal control of magnetization by instantaneous photomagnetic pulses[J].Nature,2005,435:655-657.
[1]田民波,刘德令.薄膜科学与技术手册[M].北京:机械工业出版社,1991:
[2]吴自勤,王兵.薄膜生长[M].北京:科学出版社,2001:
[3]杨邦朝,王文生.薄膜物理与技术[M].北京:电子科技大学出版社,1994:
[4]王力衡,黄运添,郑海涛.薄膜技术[M].北京:清华大学出版社,1991:
[5]S.Jeon.Structure and magnetic properties of polycrystalline FePt and CoPt thin films for high density recording media[D],2002,PA:Carnegie Mellon University.
[6]查超麟.L10 FePt基磁记录介质材料的研究[D],上海:复旦大学,2006:
[7]叶骏,磁性超薄膜磁光效应的研究[D],上海:复旦大学,2001:
[8]K.H.Bennemann.Nonlinear Optics in Metals[M].Oxford,Clarendon press,1998:2
[9]R.M.Osgood,S.D.Bader,B.M.Clemens,R.L.White and H.Matsuyama.Second-order magneto-optic effects in anisotropic thin films[J].J.Magn.Man.Mater.,1998,182:297-323.
[10]M.Thomas.Faraday Diary[M].Londan,ibid,1845:7437-7444.
[11]G.L.Eesley.Observation of Nonequilibrium Electron Heating in Copper[J].Phys.Rev.Lett.,1983,51:2140.
[12]J.Hohlfeld,J.Gudde,U.Conrad,O.Duhr,G.Korn and E.Matthias.Ultrafast magnetization dynamics of nickel[J].Appl.Phys.B,1999,68:505-510.
[1]姜寿亭,李卫.凝聚态磁性物理[M].北京,科学出版社,2005:228-235.
[2]钟文定.铁磁学(中册)[M].北京,科学出版社,2000:21-37.
[3]J.C.Slonczewski.Effect of Orbital Degeneracy on Magnetoelastic Energy[J].J.Appl.Phys.,1958:30,S310-S311:
[4]N.Tsuya.Theory of Magnetostriction and g Factor in Ferrites[J].J.Appl.Phys.,1958,29:449:
[5]E.P.Wohlfarth.铁磁材料(磁有序物质特性手册)卷Ⅰ[M].北京,电子工业出版社,1993:375-413.
[6]H.T.Savage,R.Abbundi,and A.E.Clark.Magnetomechanical coupling and magnetostriction in vertically zoned Tb_(0.27)Dy_(0.73)Fe_2[J].J.Magn.Magn.Mater.,1980,15-18:609-610
[7]A.E.Clark,J.P.Teter,and O.D.McMaster.Magnetostriction "jumps" in twinned Tb_(0.3)Dy_(0.7)Fe_(1.9)[J].J.Appl.Phys.,1998,63:319
[8]李扩社,徐静,张深根.稀土超磁致伸缩材料进展[J].金属功能材料,2003,10:30-33.
[9]A.E.Clark,and H.S.Belson.Giant Room-Temperature Magnetostrictions in TbFe_2 and DyFe_2[J].Phys.Rev.B.,1972,5:3642-3644.
[10]A.E.Dwight,and C.W.Kimball.TbFe_2,a rhombohedral Laves phase[J].Acta.Cryst.B,1974:30,2791-2793.
[11]E.Beaurepaire,J.C.Merle,A.Daunois,and J.Y.Bigot.Ultrafast spin dynamics in ferromagnetic nickel[J].Phys.Rev.Lett.,1996,76:4250-4253.
[12]G.P.Zhang,W.Hubner,E.Beaurepaire,and J.Y.Bigot.Experimental access to femtosecond spin dynamics[A].See by Spin Dynamics in Condensed Magnetic Structures I,Hillebrands B,Ounadjela K(Eds.),Topics Appl.Phys.,2002,83:245.
[13]B.Koopmans,M.van Kampen,J.T.Kohlhepp,and W.J.M.de Jonge.Ultrafast magneto-optics in nickel;magnetism or optics?[J].Phys.Rev.Lett.,2000,85:844-847.
[14]A.V.Kimel,A.Kirilyuk,P.A.Usachev,R.V.Pisarev,A.M.Balbashov and Th.Rasing.Ultrafast non-thermal control of magnetization by instantaneous photomagnetic pulses[J].Nature,2005,435:655-657.
[15]L.Guidoni,E.Beaurepaire and J.Y.Bigot.Magneto-optics in the Ultrafast Regime:Thermalization of Spin Populations in Ferromagnetic Films[J].Phys.Rev.Lett.,2002,89:017401.
[16]J.Hohlfeld,Th.Gerrits,M.Bilderbeek,Th.Rasing,H.Awano,and N.Ohta.Fast magnetization reversal of GdFeCo induced by femtosecond laser pulses[J].Phys.Rev.B,2001,65:012413.
[17]T.Ogasawara,K.Ohgushi,Y.Tomioka,K.S.Takahashi,H.Okamoto,M.Kawasaki,and Y.Tokura.General Features of Photoindueed Spin Dynamics in Ferromagnetic and Ferrimagnetic Compounds[J].Phys.Rev.Lett.,2005,94:087202.
[18]C.D.Stanciu,A.V.Kimel,F.Hansteen,A.Tsukamoto,A.Itoh,A.Kirilyuk,and Th.Rasing.Ultrafast spin dynamics across compensation points in ferrimagnetic GdFeCo:The role of angular momentum compensation[J].Phys.Rev.B,2006,73:220402.
[19]N.H.Duc.Development of giant low-field magnetostriction in a- Terfeco Hanbased single layer,multilayer and sandwich films[J].J.Magn.Magn.Mater.,2002,242:1411.
[20]M.T.Rahman,X.X.Liu,M.Matsumoto,A.Morisako,S.Meguro,and K.Akahane.Magnetoresistance in amorphous TbFeCo films with perpendicular magnetic anisotropy[J].J.Appl.Phys.,2005,97:10C515.
[21]R.J.Anderson.The thermal conductivity of rare-earth-transition-metal films as determined by the Wiedemann-Franz law[J].J.Appl.Phys.,1990,67:6914.
[22]A.V.Kimel,G.V.Astakhov,G.M.Schott,A.Kirilyuk,D.R.Yakovlev,G.Kar-czewski,W.Ossau,G.Schmidt,L.W.Molenkamp,and Th.Rasing.Picosecond Dynamics of the Photoinduced Spin Polarization in Epitaxial(Ga,Mn)As Films[J].Phys.Rev.Lett.,2004,92:237203.
[23]J.Hohlfeld,E.Matthias,R.Knorren,and K.H.Bennemann.Nonequilibrium Magnetization Dynamics of Nickel[J].Phys.Rev.Lett.,1997,78:4861.
[24]J.Gudde,J.Hohlfeld,J.G.Muller,and E.Matthias.Damage threshold dependence on electron-phonon coupling in Au and Ni films[J].Appl.Surf.Sci.,1998,127-129:40.
[25]P.Hansen,C.Clausen,G.Much,M.Rosenkranz,and K.Witter.Magnetic and magneto-optical properties of rare-earth transition-metal alloys containing Gd,Tb,Fe,Co[J].J.App.Phys.,1989,66:756.
[26]T.Kampfrath,R.G.Ulbrich,F.Leuenberger,M.MAunzenberg,B.Sass,and W.Felsch.Ultrafast magneto-optical response of iron thin films[J].Phys.Rev.B,2002, 65:104429.
[27]B.Koopmans.Laser-Induced Magnetization Dynamics[A].See by B.Hillebrands,K.Ounadjela(Eds.).Spin Dynamics in Confined Magnetic Structures Ⅱ[M],Topics Appl.Phys.,2003,87:253-320.
[28]J.Betz,K.Mackay,and D.Givord.Magnetic and magnetostrictive properties of amorphous Tb_((1-x))Co_x thin films[J].J.Magn.Magn.Mater.,1999,207:180.
[29]Y.Hayashi,T.Honda,K.I.Ishiyarna,and M.Yamaguchi.Dependence of magnetostriction of sputtered Tb-Fe films on preparation conditions[J].IEEE Trans.Magn.,1993,29:3129.
[30]C.Prados,E.Marinero,and A.Hernando.Magnetic interactions and anisotropy in amorphous TbFe films[J].J.Magn.Magn.Mater.,1997,165:414.
[31]A.E.Clark,and D.N.Crowder.High TemperatureMagnetostriction of TbFe_2and Tb_(0.27)Dy_(0.73)Fe_2.IEEE Trans.Mag.Mag.,1985,21:1945.
[32]J.Y.Bigot.Femtosecond magneto-optical processes in metals[J].C.R.Acad.Sci.,2001,2:1483-1504.
[1]T.Miki,G.Fujita,S.Imanishi,M.Furuki,and T.Sakamoto.Design of DWDD disk with groove recording for high density and wide recording power tolerance[A].Optical Memory and Optical Data Storage Topical Meeting,2002.International Symposium on,IEEE,2002,45-47.
[2]K.Sendur,C.Peng,and W.Challener.Near-Field Radiation from a Ridge Waveguide Transducer in the Vicinity of a Solid Immersion Lens[J].Phys.Rev.Lett.,2005,94:043901.
[3]M Mallary.Field enhancing magnetic pole for magneto-optical recording and reproducing device[P].US,Patent 6351436,2002
[4]H.Sukeda,H.Saga,H.Nemoto,Y.Itou,C.Haginoya,and T.Matsumoto.Thermally Assisted Magnetic Recording on Flux-Detectable RE-TM Media[J].IEEE Trans.Magn.,2001,37:1234-1238.
[5]C.D.Stanciu,A.V.Kimel,F.Hansteen,A.Tsukamoto,A.Itoh,A.Kirilyuk,and Th.Rasing.Ultrafast spin dynamics across compensation points in ferrimagnetic GdFeCo:The role of angular momentum compensation[J].Phys.Rev.B,2006,73:220402.
[6]A.Tsukamoto,K.Nakagawa,A.Itoh,A.Kimel,A.Tsvetkov,H.Awano,N.Ohta,A.Kirilyuk,and Th.Rasing.Excitation of Coherent Spin Waves at Ultrafast Thermomagnetic Writing[J].IEEE Trans.Magn.,2004,40:2543-2545.
[7]吴周令,范正修,王之江.强激光对薄膜的损伤研究[J].物理,1991,20:93-96.
[8]M.L.Protopapa,F.D.Tomasi,and M.R.Perrone.Laser damage studies on MgF2thin films[J].J.Vac.Sci.Technol.,A,2001,19:681.
[9]E.Hacker,H.Lauth,and P.Weiβbrodt.Review of structural influences on the laser damage thresholds ofoxide coatings[J].SPIE,2005,2714:316.
[10]J.Gudde,J.Hohlfeld,J.G.Muller,and E.Matthias.Damage threshold dependence on electron-phonon coupling in Au and Ni films[J].Appl.Surf.Sci.,1998,127-129:40-45.
[11]S.D.Brorson,J.G.Fujimoto,and E.P.Ippen.Femtosecond electronic heat-transport dynamics in thin gold films[J].Phys.Rev.Lett.,1987,59:1962.
[12]C.Suarez,W.E.Bron,and T.Jnhasz.Dynamics and Transport of Electronic Carriers in Thin Gold Films[J].Phys.Rev.Lett.,1995,75:4536.
[13]J.Hohlfeld,J.G.Muller,S.S.Wellershoff,and E.Matthias.Time-resolved thermoreflectivity of thin gold films and its dependence on film thickness[J].Appl.Phys.B,1997,64:387.
[14]S.I.Anisimov,B.Kapeliovich,and T.L.Perelman.Electron emission from metal surfaces exposed to ultra-short laser pulses[J].Soy.Phys.JETP,1974,39:375.
[15]P.B.Corkum,F.Brunel,and N.K.Sherman.Thermal Response of Metals to Ultrashort-Pulse Laser Excitation[J].Phys.Rev.Lett.,1988,61:2886.
[16]E.Beaurepaire,J.C.Merle,A.Daunois,and J.Y.Bigot.Ultrafast Spin Dynamics in Ferromagnetic Nickel[J].Phys.Rev.Lett.,1996,76:4250.
[17]B.Koopmans,M.van Kampen,J.T.Kohlhepp,and W.J.M.de Jonge.Ultrafast Magneto-Optics in Nickel:Magnetism or Optics?[J].Phys.Rev.Lett.,2000,85:844.
[18]A.V.Kimel,A.Kirilyuk,A.Tsvetkov,R.V.Pisarev,and Th.Rasing.Laser induced ultrafast spin reorientation in the antiferromagnet TmFeO_3[J].Nature,2004,429:850.
[19]G.P.Zhang,W.Hubner,E.Beaurepaire,and J.Y.Bigot.Experimental access to femtosecond spin dynamics[A].See by Spin Dynamics in Condensed Magnetic Structures I,Hillebrands B,Ounadjela K(Eds.),Topics Appl.Phys.,2002,83:245.
[20]M.Vomir,L.H.F.Andrade,L.Guidoni,E.Beaurepaire,and J.Y.Bigot.Real Space Trajectory of the Ultrafast Magnetization Dynamics in Ferromagnetic Metals [J].Phys.Rev.Lett.,2005,94:237601.
[21]J.Hohlfeld,E.Matthias,R.Knorren,and K.H.Bennemann.Nonequilibrium Magnetization Dynamics of Nickel[J].Phys.Rev.Lett.,1997,78:4861.
[22]A.Scholl,L.Baumgarten,R.Jacquemin,and W.Eberhardt.Ultrafast Spin Dynamics of Ferromagnetic Thin Films Observed by fs Spin-Resolved Two-Photon Photoemission[J].Phys.Rev.Lett.,1997,79:5146.
[23]J.Hohlfeld,Th.Gerrits,M.Bilderbeek,Th.Rasing,H.Awano,and N.Ohta.Fast magnetization reversal of GdFeCo induced by femtosecond laser pulses[J].Phys.Rev.B,2001,65:012413.
[24]W.Martienssen,and H.Warlimont.Springer Handbook of Condensed Matter and Materials Data[M].Springer,Berlin,2005,10-205.
[25]E.A.Guliants,and W.A.Anderson.Study of dynamics and mechanism of metal-induced silicon growth[J].J.Appl.Phys.,2001,89:4648.
[26]J.Y.Hwang,C.R.Cho,S.A.Lee,and S.Y.Jeong.Epitaxial Growth and Structural Characterization of Transparent Conducting ZnO:Al Thin Film[J].J.Korean Phys.Soc.,2005,47:S288.
[27]J.Y.Bigot.Femtosecond magneto-optical processes in metals[J].C.R.Acad.Sci.,2001,2:1483-1504.
[1]J.Zhou,R.Skomski,and X.Z.Li et al.Permanent-magnet properties of thermally processed FePt and FePt-Fe multilayer films[J],IEEE Trans.Magn.,2002,38: 2802-2804.
[2]O.Hellwig,J.B.Kortright,and K.Takano et al.Switching behavior of Fe-Pt/Ni-Fe exchange-spring films studied by resonant soft-x-ray magneto-optical Kerr effect[J].Phys.Rev.B,2000,62:11694-11698
[3]S.S.Yan,J.A.Barnard,and F.T.Xu et al.Critical dimension of the transition from single switching to an exchange spring process in hard-soft exchange-coupled bilayers[J].Phys.Rev.B,2001,64:184403
[4]S.S.Yan,W.J.Liu,and J.L.Weston et al.Magnetization-reversal mechanism of hard-soft exchange-coupled trilayers[J],Phys.Rev.B,2001,63:174415
[5]Y.Sonobe,H.Muraoka,K.Miura,and Y.Nakamura et al.Thermally stable CGC perpendicular recording media with Pt-rich CoPtCr and thin Pt layers[J].IEEE Trans.Magn.,2002,38(5):2006.
[6]Y.Sonobe,and H.Nakagawa et al.,Coupled granular/continuous perpendicular recording media with soft magnetic underlayer[J].J.Appl.Phys.,2002,91:8055
[7]J.P.Wang,W.K.Shen,J.M.Bai.Exchange Coupled Composite Media for Perpendicular Magnetic Recording[J].IEEE Trans.Magn.,2005,41:3181.
[8]J.P.Wang,W.K.Shen,and J.M.Bai et al,Composite media(dynamic tilted media) for magnetic recording[J].Appl.Phys.Lett.,2005,86:142504.
[9]R.H.Victora and X.Shen.Exchange coupled composite media for perpendicular magnetic recording[J].IEEE Trans.Magn.,2005,41:2828.
[10]J.U.Thiele,S.Maat,and E.E.Fullerton.FeRh/FePt exchange spring films for thermally assisted magnetic recording media[J].Appl.Phys.Lett.,2003,82,2859.
[11]Z.L.Zhao,J.S.Chen,J.Ding,J.B.Yi,B.H.Liu,and J.P.Wang.Fabrication and microstructure of high coercivity FePt thin films at 400℃[J].Appl.Phys.Lett.,2006,88,052503.
[12]F.G.Sancheza,O.C.Fesenko,O.Mryasov,R.W.Chantrell,and K.Yu.Guslienko.Exchange spring structures and coercivity reduction in FePt/FeRh bilayers:A comparison of multiscale and micromagnetic calculations[J].Appl.Phys.Lett.,2005,87:122501.
[13]R.H.Victora,and X.Shen.Composite media for perpendicular magnetic recording[J].IEEE Trans.Magn.,2005,41,537.
[14]E.Beaurepaire,J.C.Merle,A.Daunois,and J.Y.Bigot.Ultrafast spin dynamics in ferromagnetic nickel[J].Phys.Rev.Lett.1996,76:4250-4253.
[15]A.V.Kimel,A.Kirilyuk,P.A.Usachev,R.V.Pisarev,A.M.Balbashov,and Th. Rasing.Ultrafast non-thermal control of magnetization by instantaneous photomagnetic pulses[J].Nature,2005,435:655-657.
[16]T.Ogasawara and K.Ohgushi,Y.Tomioka,K.S.Takahashi,H.Okamoto,M.Kawasaki,and Y.Tokura.General Features of Photoinduced Spin Dynamics in Ferromagnetic and Ferrimagnetic Compounds[J].Phys.Rev.Lett.,2005,94:087202.
[17]C.D.Stanciu,A.V.Kimel,F.Hansteen,A.Tsukamoto,A.Itoh,A.Kirilyuk,and Th.Rasing.Ultrafast spin dynamics across compensation points in ferrimagnetic GdFeCo:The role of angular momentum compensation[J].Phys.Rev.B,2006,73:220402.
[18]M.Vomir,L.H.F.Andrade,L.Guidoni,E.Beaurepaire,and J.Y.Bigot.Real Space Trajectory of the Ultrafast Magnetization Dynamics in Ferromagnetic Metals [J].Phys.Rev.Lett.,2005,94:237601.
[19]G.Ju,A.V.Nurmikko,R.F.C.Farrow,R.F.Marks,M.J.Carey,and B.A.Gurney.Ultrafast Time Resolved Photoinduced Magnetization Rotation in a Ferromagnetic/Antiferromagnetic Exchange Coupled System[J].Phys.Rev.lett.,1999,82:3705.
[20]G.Ju,and L.Chen.Coherent magnetization rotation induced by optical modulation in ferromagnetic/antiferromagnetic exchange-coupled bilayers[J].Phys.Rev.B,2000,62:1171.
[21]M.C.Weber,H.Nembach,and J.Fassbender.All-optical probe of magnetization dynamics in exchange biased bilayers on the picosecond timescale[J].J.Appl.Phys.,2004,95:6613.
[22]G.P.Zhang,W.Hubner,E.Beaurepaire,and J.Y.Bigot.Experimental access to femtosecond spin dynamics[A].See by Spin Dynamics in Condensed Magnetic Structures I,B.Hillebrands,K.Ounadjela(Eds.),Topics Appl.Phys.,2002,83:245.
[2]W.D.Doyle,L.He,and P.J.Flanders.Measurement of the Switching Speed Limit in High Coercivity Magnetic Media[J].IEEE Trans.Magn.,1993,29:3634.
[3]W.K.Hieber,A.Stankiewicz,and M.R.Freeeman.Direct Observation of Magnetic Relaxation in a Small PermaUoy Disk by Time-Resolved Scanning Kerr Microscopy[J].Phys.Rev.Lett.,1997,79:1134.
[4]T.J.Silva,C.S.Lee,T.M.Crawford,and C.T.Rogers.Inductive measurement of ultrafast magnetization dynamics in thin-film Permalloy[J].J.Appl.Phys.,1999,85:7849.
[5]R.H.Koch,J.G..Deak,D.W.Abraham,P.L.Trouilloud,R.A.Altman,Y.Lu,W.J.Gallagher,R.E.Scheuerlein,K.P.Roche,and S.S.P.Parkin.Magnetization Reversal in Micron-Sized Magnetic Thin Films[J].Phys.Rev.Lett.,1998,81:4512.
[6]J.J.Baumberg,S.A.Crooker,D.D.Awschalom,N.Samarth,H.Luo,and J.K.Furdyna.Ultrafast Faraday spectroscopy in magnetic semiconductor quantum structures[J].Phys.Rev.B,1994,50:7689-7700.
[7]A.Y.Elezabbi,and M.R.Freeman.Ultrafast magneto-optic sampling of picosecond current pulses[J].Appl.Phys.Lett.,1996,68:3546-3548.
[8]A.Y.Elezzabi,M.R.Freeman,and M.Johnson.Direct measurement of the conduction electron spin-lattice relaxation time T_1 in gold[J].Phys.Rev.Lett.,1996,77:3220-3223.
[9]W.K.Hiebert,A.Stankiewicz,and M.R.Freeman.Direct observation of magnetic relaxation in a small Permalloy disk by time-resolved scanning Kerr microscopy[J].Phys.Rev.Lett.,1997,79:1134-1137.
[10]H.C.Siegmann,E.L.Garwin,C.Y.Prescott,J.Heidmann,D.Mauri,D.Weller,R.Allenspach,and W.Weber.Magnetism with picosecond.eld pulses[J].J.Magn.Magn.Mater.,1995,151:L8-L12.
[11]G L.Eesley.Observation of Nonequilibrium Electron Heating in Copper[J].Phys.Rev.Lett.,1983,51:2140.
[12]J.G.Fujimoto,J.M.Liu,E.P.Ippen,and N.Bloembergen.Femtosecond Laser Interaction with Metallic Tungsten and Nonequilibrium Electron and Lattice Temperatures[J].Phys.Rev.Lett.,1984,53:1837.
[13]E.Beaurepaire,J.C.Merle,A.Daunois,and J.Y.Bigot.Ultrafast spin dynamics in ferromagnetic nickel[J].Phys.Rev.Lett.,1996,76:4250-4253.
[14]J.M.Kikkawa and D.D.Awschalom.All-optical magnetic resonance in semiconductors[J].Science,2000,287:473-476.
[15]J.A.Gupta,R.Knobel,N.Samarth,and D.D.Awschalom.Ultrafast manipulation of electron spin coherence[J].Science,2001,292:2458-2461.
[16]G.Ju,A.Vertikov,A.V.Nurmikko,C.Canady,G.Xiao,R.F.C.Farrow,and A.Cebollada.Ultrafast nonequilibrium spin dynamics in a ferromagnetic thin film[J].Phys.Rev.B,1998,57:R700-R703.
[17]T.Kampfrath,R.G.Ulbrich,F.Leuenberger,M.Munzenberg,B.Sass and W.Felsch.Ultrafast magneto-optical response of iron thin films[J].Phys.Rev.B,2002,65:104429-1-6.
[18]J.Y.Bigot.Femtosecond magneto-optical processes in metals[J].C.R.Acad.Sci.,2001,2:1483-1504.
[19]Bloch F.Nuclear Induction[J].Phys.Rev.1946,70,460.
[20]L.Landau,and L.Lifshitz.On the theory of the dispersion of magnetic permeability in ferromagnetic bodies[J].Phys.Z.Sowjetunion,1935,8:153.
[21]T.L.Gilbert.A Lagrangian Formulation of the Gyromagnetic Equation of the Magnetization Field[J].Phys.Rev.,1935,100:1243.
[22]J.Ferre,V.Grolier,P.Meyer,S.Lemerle,A.Maziewski,E.Stefanowicz,S.V. Tarasenko,V.V.Tarasenko,M.Kisielewski,and D.Renard.Magnetization-reversal processes in an ultrathin Co/Au film[J].Phys.Rev.B,1997,55:15092.
[23]B.Hillebrands,and K.Ounadjela(Eds.).Spin Dynamics in Confined Magnetic Structures Ⅱ[M].Topics Appl.Phys.2003,87:253-320.
[24]R.Knorren,K.H.Bennemann,R.Burgermeister,and M.Aeschlimann.Dynamics of excited electrons in copper and ferromagnetic transition metals:Theory and experiment[J].Phys.Rev.B,2000,61:9427-9440.
[25]W.S.Fann,R.Storz,H.W.K.Tom,and J.Bokor.Electron thermalization in gold[J].Phys.Rev.B,1992,46:13592-13595.
[26]C.K.Sun,F.Vallee,L.H.Acioli,E.P.Ippen,and J.G.Fulimoto.Femtosecondtunable measurement of electron thermalization in gold[J].Phys.Rev.B,1994,50:15337.
[27]R.G.H.Groeneveld,R.Sprik,and A.Lagendijk.Femtoseeond spectroscopy of electron-electron and electron-phonon energy relaxation in Ag and Au[J].Phys.Rev.B,1995,51:11433.
[28]B.Sinkovic,L.H.Tjeng,N.B.Brookes,J.B.Goedkoop,R.Hesper,E.Pellegrin,F.M.F.de Groot,S.Altieri,S.L.Hulbert,E.Shekel,and G.A.Sawatzky.Local Electronic and Magnetic Structure of Ni below and above TC:A spin-resolved circularly polarized resonant photoemission study[J].Phys.Rev.Lett.,1997,79:3510-3513.
[29]T.J.Kreutz,T.Greber,P.Aebi,and J.Osterwalder.Temperature-dependent electronic structure of nickel metal[J].Phys.Rev.B,1998,58:1300-1317.
[30]M.Farle.Ferromagnetic resonance of ultrathin metallic layers[J].Prog.Rep.Phys.,1998,61:755-826.
[31]G.Ju,A.V.Nurmikko,R.F.C.Farrow,R.F.Marks,M.J.Carey,and B.A.Gurney.Coherent magnetization rotation by optical modulation in ferromagnetic /antiferromagnetic exchange-coupled bilayers[J].Phys.Rev.B,2000,62:1171-1177.
[32]G.Ju,A.V.Nurmikko,R.F.C.Farrow,R.F.Marks,M.J.Carey,and B.A.Gurney.Ultrafast optical modulation of an exchange biased ferromagnetic /antiferromagnetic bilayer[J].Phys.Rev.B,1998,58:R11857-R11860.
[33]M.B.Agranat,S.I.Ashikov,A.B.Granovskii,and G.I.Rukman.Interaction of picosecond laser pulses with the electron,spin and phonon subsystem of nickel[J].Sov.Phys.JETP,1984,59:804-806.
[34]A.Vaterlaus,T.Beutler,and F.Meier.Spin-lattice relaxation time of ferromagnetic gadolinium determined with time-resolved spin-polarized photoemission[J].Phys.Rev.Lett.,1991,67:3314-3317.
[35]A.Vaterlaus,T.Beutler,D.Guarisco,M.Lutz,and F.Meier.Spin-lattice relaxation in ferromagnets studied by time-resolved spin-polarized photoemission[J].Phys.Rev.B,1992,46:5280-5286.
[36]J.Hohlfeld,E.Matthias,R.Knorren,and K.H.Bennemann.Nonequilibrium magnetization dynamics of nickel[J].Phys.Rev.Lett.1997,78:4861-4864.
[37]J.Gudde,U.Conrad,V.Jahnke,J.Hohlfeld,and E.Matthias.Magnetization dynamics of Ni and Co.1ms on Cu(001) and of bulk nickel surfaces[J].Phys.Rev.B,1999,59:R6608-R6611.
[38]J.Hohlfeld,J.Gudde,U.Conrad,O.Duhr,G.Korn,and E.Matthias.Ultrafast magnetization dynamics of nickel[J].Appl.Phys.B,1999,68:505-510.
[39]A.Scholl,L.Baumgarten,R.Jacquemin,and W.Eberhardt.Ultrafast spin dynamics of ferromagnetic thin films observed by femtosecond spin-resolved two photon photemission[J].Phys.Rev.Lett.,1997,79:5146-5149.
[40]U.Conrad,J.Gudde,V.Jahnke,and E.Matthias.Ultrafast magnetization and electron dynamics of thin Ni and Co films on Cu(001) observed by time-resolved SHG[J].Appl.Phys.B,1999,68:511-517(1999).
[41]J.Hohlfeld.Utrafast electron-,lattice- and spin-dynamics in metals:Investigated by linear and nonlinear optical techniques[D].Ph.D.Thesis,Freie University,Berlin,1998.
[42]M.Aeschlimann,M.Bauer,S.Pawlik,W.Weber,R.Burgermeister,D.Oberli,and H.C.Siegmann.Ultrafast spin-dependent electron dynamics in fee Co[J].Phys.Rev.Lett.,1997,79:5158-5161.
[43]R.Knorren,K.H.Bennemann,R.Burgermeister,and M.Aeschlimann.Dynamics of excited electrons in copper and ferromagnetic transition metals:Theory and experiment[J].Phys.Rev.B,2000,61:9427-9440.
[44]E.Beaurepaire,M.Maret,V.Halte,J.C.Merle,A.Daunois,and J.Y.Bigot.Spin dynamics in CoPt3 alloy films:A magnetic phase transition in the femtosecond time scale[J].Phys.Rev.B,1998,58:12134-12137.
[45]J.Hohlfeld,T.Gerrits,M.Bilderbeek,T.Rasing,H.Awano,and N.Ohta.Fast magnetization reversal of GdFeCo induced by femtosecond laser pulses[J].Phys.Rev.B,2001,65:012413.
[46]G.Ju,A.Vertikov,A.V.Nurmikko,C.Canady,G.Xiao,R.F.C.Farrow,and A.Cebollada.Ultrafast nonequilibrium spin dynamics in a ferromagnetic thin film,Phys.Rev.B,1998,57:R700-R703.
[47]T.Kise,T.Ogasawara,M.Ashida,Y.Tomioka,Y.Tokura,and M.Kuwata-Gonokami.Ultrafast spin dynamics and critical behavior in half-metallic ferromagnet:Sr_2FeMoO_6[J].Phys.Rev.Lett.,2000,85:1986-1989.
[48]B.Koopmans,M.van Kampen,J.T.Kohlhepp,and W.J.M.de Jonge.Ultrafast magneto-optics in nickel;magnetism or optics?[J].Phys.Rev.Lett.,2000,85:844-847.
[49]B.Koopmans,M.van Kampen,J.T.Kohlhepp,and W.J.M.de Jonge.Experimental access to femtosecond spin dynamics[J].J.Phys.:Condens.Matt.,2002,14:1-14.
[50]H.Regensburger,R.Vollmer and J.Kirschner.Time-resolved magnetization induced second-harmonic generation from the Ni(110) surface[J].Phys.Rev.B,2000,61:14716-14719.
[51]B.Koopmans,M.van Kampen,J.T.Kohlhepp,and W.J.M.de Jonge.Femtosecond spin dynamics of epitaxial Cu(111)/Ni/Cu wedges[J].J.Appl.Phys.,2000,87:5070-5072.
[52]A.V.Kimel,A.Kirilyuk,P.A.Usachev,R.V.Pisarev,A.M.Balbashov,and Th.Rasing.Ultrafast non-thermal control of magnetization by instantaneous photomagnetic pulses[J].Nature,2005,435:655-657.
[1]田民波,刘德令.薄膜科学与技术手册[M].北京:机械工业出版社,1991:
[2]吴自勤,王兵.薄膜生长[M].北京:科学出版社,2001:
[3]杨邦朝,王文生.薄膜物理与技术[M].北京:电子科技大学出版社,1994:
[4]王力衡,黄运添,郑海涛.薄膜技术[M].北京:清华大学出版社,1991:
[5]S.Jeon.Structure and magnetic properties of polycrystalline FePt and CoPt thin films for high density recording media[D],2002,PA:Carnegie Mellon University.
[6]查超麟.L10 FePt基磁记录介质材料的研究[D],上海:复旦大学,2006:
[7]叶骏,磁性超薄膜磁光效应的研究[D],上海:复旦大学,2001:
[8]K.H.Bennemann.Nonlinear Optics in Metals[M].Oxford,Clarendon press,1998:2
[9]R.M.Osgood,S.D.Bader,B.M.Clemens,R.L.White and H.Matsuyama.Second-order magneto-optic effects in anisotropic thin films[J].J.Magn.Man.Mater.,1998,182:297-323.
[10]M.Thomas.Faraday Diary[M].Londan,ibid,1845:7437-7444.
[11]G.L.Eesley.Observation of Nonequilibrium Electron Heating in Copper[J].Phys.Rev.Lett.,1983,51:2140.
[12]J.Hohlfeld,J.Gudde,U.Conrad,O.Duhr,G.Korn and E.Matthias.Ultrafast magnetization dynamics of nickel[J].Appl.Phys.B,1999,68:505-510.
[1]姜寿亭,李卫.凝聚态磁性物理[M].北京,科学出版社,2005:228-235.
[2]钟文定.铁磁学(中册)[M].北京,科学出版社,2000:21-37.
[3]J.C.Slonczewski.Effect of Orbital Degeneracy on Magnetoelastic Energy[J].J.Appl.Phys.,1958:30,S310-S311:
[4]N.Tsuya.Theory of Magnetostriction and g Factor in Ferrites[J].J.Appl.Phys.,1958,29:449:
[5]E.P.Wohlfarth.铁磁材料(磁有序物质特性手册)卷Ⅰ[M].北京,电子工业出版社,1993:375-413.
[6]H.T.Savage,R.Abbundi,and A.E.Clark.Magnetomechanical coupling and magnetostriction in vertically zoned Tb_(0.27)Dy_(0.73)Fe_2[J].J.Magn.Magn.Mater.,1980,15-18:609-610
[7]A.E.Clark,J.P.Teter,and O.D.McMaster.Magnetostriction "jumps" in twinned Tb_(0.3)Dy_(0.7)Fe_(1.9)[J].J.Appl.Phys.,1998,63:319
[8]李扩社,徐静,张深根.稀土超磁致伸缩材料进展[J].金属功能材料,2003,10:30-33.
[9]A.E.Clark,and H.S.Belson.Giant Room-Temperature Magnetostrictions in TbFe_2 and DyFe_2[J].Phys.Rev.B.,1972,5:3642-3644.
[10]A.E.Dwight,and C.W.Kimball.TbFe_2,a rhombohedral Laves phase[J].Acta.Cryst.B,1974:30,2791-2793.
[11]E.Beaurepaire,J.C.Merle,A.Daunois,and J.Y.Bigot.Ultrafast spin dynamics in ferromagnetic nickel[J].Phys.Rev.Lett.,1996,76:4250-4253.
[12]G.P.Zhang,W.Hubner,E.Beaurepaire,and J.Y.Bigot.Experimental access to femtosecond spin dynamics[A].See by Spin Dynamics in Condensed Magnetic Structures I,Hillebrands B,Ounadjela K(Eds.),Topics Appl.Phys.,2002,83:245.
[13]B.Koopmans,M.van Kampen,J.T.Kohlhepp,and W.J.M.de Jonge.Ultrafast magneto-optics in nickel;magnetism or optics?[J].Phys.Rev.Lett.,2000,85:844-847.
[14]A.V.Kimel,A.Kirilyuk,P.A.Usachev,R.V.Pisarev,A.M.Balbashov and Th.Rasing.Ultrafast non-thermal control of magnetization by instantaneous photomagnetic pulses[J].Nature,2005,435:655-657.
[15]L.Guidoni,E.Beaurepaire and J.Y.Bigot.Magneto-optics in the Ultrafast Regime:Thermalization of Spin Populations in Ferromagnetic Films[J].Phys.Rev.Lett.,2002,89:017401.
[16]J.Hohlfeld,Th.Gerrits,M.Bilderbeek,Th.Rasing,H.Awano,and N.Ohta.Fast magnetization reversal of GdFeCo induced by femtosecond laser pulses[J].Phys.Rev.B,2001,65:012413.
[17]T.Ogasawara,K.Ohgushi,Y.Tomioka,K.S.Takahashi,H.Okamoto,M.Kawasaki,and Y.Tokura.General Features of Photoindueed Spin Dynamics in Ferromagnetic and Ferrimagnetic Compounds[J].Phys.Rev.Lett.,2005,94:087202.
[18]C.D.Stanciu,A.V.Kimel,F.Hansteen,A.Tsukamoto,A.Itoh,A.Kirilyuk,and Th.Rasing.Ultrafast spin dynamics across compensation points in ferrimagnetic GdFeCo:The role of angular momentum compensation[J].Phys.Rev.B,2006,73:220402.
[19]N.H.Duc.Development of giant low-field magnetostriction in a- Terfeco Hanbased single layer,multilayer and sandwich films[J].J.Magn.Magn.Mater.,2002,242:1411.
[20]M.T.Rahman,X.X.Liu,M.Matsumoto,A.Morisako,S.Meguro,and K.Akahane.Magnetoresistance in amorphous TbFeCo films with perpendicular magnetic anisotropy[J].J.Appl.Phys.,2005,97:10C515.
[21]R.J.Anderson.The thermal conductivity of rare-earth-transition-metal films as determined by the Wiedemann-Franz law[J].J.Appl.Phys.,1990,67:6914.
[22]A.V.Kimel,G.V.Astakhov,G.M.Schott,A.Kirilyuk,D.R.Yakovlev,G.Kar-czewski,W.Ossau,G.Schmidt,L.W.Molenkamp,and Th.Rasing.Picosecond Dynamics of the Photoinduced Spin Polarization in Epitaxial(Ga,Mn)As Films[J].Phys.Rev.Lett.,2004,92:237203.
[23]J.Hohlfeld,E.Matthias,R.Knorren,and K.H.Bennemann.Nonequilibrium Magnetization Dynamics of Nickel[J].Phys.Rev.Lett.,1997,78:4861.
[24]J.Gudde,J.Hohlfeld,J.G.Muller,and E.Matthias.Damage threshold dependence on electron-phonon coupling in Au and Ni films[J].Appl.Surf.Sci.,1998,127-129:40.
[25]P.Hansen,C.Clausen,G.Much,M.Rosenkranz,and K.Witter.Magnetic and magneto-optical properties of rare-earth transition-metal alloys containing Gd,Tb,Fe,Co[J].J.App.Phys.,1989,66:756.
[26]T.Kampfrath,R.G.Ulbrich,F.Leuenberger,M.MAunzenberg,B.Sass,and W.Felsch.Ultrafast magneto-optical response of iron thin films[J].Phys.Rev.B,2002, 65:104429.
[27]B.Koopmans.Laser-Induced Magnetization Dynamics[A].See by B.Hillebrands,K.Ounadjela(Eds.).Spin Dynamics in Confined Magnetic Structures Ⅱ[M],Topics Appl.Phys.,2003,87:253-320.
[28]J.Betz,K.Mackay,and D.Givord.Magnetic and magnetostrictive properties of amorphous Tb_((1-x))Co_x thin films[J].J.Magn.Magn.Mater.,1999,207:180.
[29]Y.Hayashi,T.Honda,K.I.Ishiyarna,and M.Yamaguchi.Dependence of magnetostriction of sputtered Tb-Fe films on preparation conditions[J].IEEE Trans.Magn.,1993,29:3129.
[30]C.Prados,E.Marinero,and A.Hernando.Magnetic interactions and anisotropy in amorphous TbFe films[J].J.Magn.Magn.Mater.,1997,165:414.
[31]A.E.Clark,and D.N.Crowder.High TemperatureMagnetostriction of TbFe_2and Tb_(0.27)Dy_(0.73)Fe_2.IEEE Trans.Mag.Mag.,1985,21:1945.
[32]J.Y.Bigot.Femtosecond magneto-optical processes in metals[J].C.R.Acad.Sci.,2001,2:1483-1504.
[1]T.Miki,G.Fujita,S.Imanishi,M.Furuki,and T.Sakamoto.Design of DWDD disk with groove recording for high density and wide recording power tolerance[A].Optical Memory and Optical Data Storage Topical Meeting,2002.International Symposium on,IEEE,2002,45-47.
[2]K.Sendur,C.Peng,and W.Challener.Near-Field Radiation from a Ridge Waveguide Transducer in the Vicinity of a Solid Immersion Lens[J].Phys.Rev.Lett.,2005,94:043901.
[3]M Mallary.Field enhancing magnetic pole for magneto-optical recording and reproducing device[P].US,Patent 6351436,2002
[4]H.Sukeda,H.Saga,H.Nemoto,Y.Itou,C.Haginoya,and T.Matsumoto.Thermally Assisted Magnetic Recording on Flux-Detectable RE-TM Media[J].IEEE Trans.Magn.,2001,37:1234-1238.
[5]C.D.Stanciu,A.V.Kimel,F.Hansteen,A.Tsukamoto,A.Itoh,A.Kirilyuk,and Th.Rasing.Ultrafast spin dynamics across compensation points in ferrimagnetic GdFeCo:The role of angular momentum compensation[J].Phys.Rev.B,2006,73:220402.
[6]A.Tsukamoto,K.Nakagawa,A.Itoh,A.Kimel,A.Tsvetkov,H.Awano,N.Ohta,A.Kirilyuk,and Th.Rasing.Excitation of Coherent Spin Waves at Ultrafast Thermomagnetic Writing[J].IEEE Trans.Magn.,2004,40:2543-2545.
[7]吴周令,范正修,王之江.强激光对薄膜的损伤研究[J].物理,1991,20:93-96.
[8]M.L.Protopapa,F.D.Tomasi,and M.R.Perrone.Laser damage studies on MgF2thin films[J].J.Vac.Sci.Technol.,A,2001,19:681.
[9]E.Hacker,H.Lauth,and P.Weiβbrodt.Review of structural influences on the laser damage thresholds ofoxide coatings[J].SPIE,2005,2714:316.
[10]J.Gudde,J.Hohlfeld,J.G.Muller,and E.Matthias.Damage threshold dependence on electron-phonon coupling in Au and Ni films[J].Appl.Surf.Sci.,1998,127-129:40-45.
[11]S.D.Brorson,J.G.Fujimoto,and E.P.Ippen.Femtosecond electronic heat-transport dynamics in thin gold films[J].Phys.Rev.Lett.,1987,59:1962.
[12]C.Suarez,W.E.Bron,and T.Jnhasz.Dynamics and Transport of Electronic Carriers in Thin Gold Films[J].Phys.Rev.Lett.,1995,75:4536.
[13]J.Hohlfeld,J.G.Muller,S.S.Wellershoff,and E.Matthias.Time-resolved thermoreflectivity of thin gold films and its dependence on film thickness[J].Appl.Phys.B,1997,64:387.
[14]S.I.Anisimov,B.Kapeliovich,and T.L.Perelman.Electron emission from metal surfaces exposed to ultra-short laser pulses[J].Soy.Phys.JETP,1974,39:375.
[15]P.B.Corkum,F.Brunel,and N.K.Sherman.Thermal Response of Metals to Ultrashort-Pulse Laser Excitation[J].Phys.Rev.Lett.,1988,61:2886.
[16]E.Beaurepaire,J.C.Merle,A.Daunois,and J.Y.Bigot.Ultrafast Spin Dynamics in Ferromagnetic Nickel[J].Phys.Rev.Lett.,1996,76:4250.
[17]B.Koopmans,M.van Kampen,J.T.Kohlhepp,and W.J.M.de Jonge.Ultrafast Magneto-Optics in Nickel:Magnetism or Optics?[J].Phys.Rev.Lett.,2000,85:844.
[18]A.V.Kimel,A.Kirilyuk,A.Tsvetkov,R.V.Pisarev,and Th.Rasing.Laser induced ultrafast spin reorientation in the antiferromagnet TmFeO_3[J].Nature,2004,429:850.
[19]G.P.Zhang,W.Hubner,E.Beaurepaire,and J.Y.Bigot.Experimental access to femtosecond spin dynamics[A].See by Spin Dynamics in Condensed Magnetic Structures I,Hillebrands B,Ounadjela K(Eds.),Topics Appl.Phys.,2002,83:245.
[20]M.Vomir,L.H.F.Andrade,L.Guidoni,E.Beaurepaire,and J.Y.Bigot.Real Space Trajectory of the Ultrafast Magnetization Dynamics in Ferromagnetic Metals [J].Phys.Rev.Lett.,2005,94:237601.
[21]J.Hohlfeld,E.Matthias,R.Knorren,and K.H.Bennemann.Nonequilibrium Magnetization Dynamics of Nickel[J].Phys.Rev.Lett.,1997,78:4861.
[22]A.Scholl,L.Baumgarten,R.Jacquemin,and W.Eberhardt.Ultrafast Spin Dynamics of Ferromagnetic Thin Films Observed by fs Spin-Resolved Two-Photon Photoemission[J].Phys.Rev.Lett.,1997,79:5146.
[23]J.Hohlfeld,Th.Gerrits,M.Bilderbeek,Th.Rasing,H.Awano,and N.Ohta.Fast magnetization reversal of GdFeCo induced by femtosecond laser pulses[J].Phys.Rev.B,2001,65:012413.
[24]W.Martienssen,and H.Warlimont.Springer Handbook of Condensed Matter and Materials Data[M].Springer,Berlin,2005,10-205.
[25]E.A.Guliants,and W.A.Anderson.Study of dynamics and mechanism of metal-induced silicon growth[J].J.Appl.Phys.,2001,89:4648.
[26]J.Y.Hwang,C.R.Cho,S.A.Lee,and S.Y.Jeong.Epitaxial Growth and Structural Characterization of Transparent Conducting ZnO:Al Thin Film[J].J.Korean Phys.Soc.,2005,47:S288.
[27]J.Y.Bigot.Femtosecond magneto-optical processes in metals[J].C.R.Acad.Sci.,2001,2:1483-1504.
[1]J.Zhou,R.Skomski,and X.Z.Li et al.Permanent-magnet properties of thermally processed FePt and FePt-Fe multilayer films[J],IEEE Trans.Magn.,2002,38: 2802-2804.
[2]O.Hellwig,J.B.Kortright,and K.Takano et al.Switching behavior of Fe-Pt/Ni-Fe exchange-spring films studied by resonant soft-x-ray magneto-optical Kerr effect[J].Phys.Rev.B,2000,62:11694-11698
[3]S.S.Yan,J.A.Barnard,and F.T.Xu et al.Critical dimension of the transition from single switching to an exchange spring process in hard-soft exchange-coupled bilayers[J].Phys.Rev.B,2001,64:184403
[4]S.S.Yan,W.J.Liu,and J.L.Weston et al.Magnetization-reversal mechanism of hard-soft exchange-coupled trilayers[J],Phys.Rev.B,2001,63:174415
[5]Y.Sonobe,H.Muraoka,K.Miura,and Y.Nakamura et al.Thermally stable CGC perpendicular recording media with Pt-rich CoPtCr and thin Pt layers[J].IEEE Trans.Magn.,2002,38(5):2006.
[6]Y.Sonobe,and H.Nakagawa et al.,Coupled granular/continuous perpendicular recording media with soft magnetic underlayer[J].J.Appl.Phys.,2002,91:8055
[7]J.P.Wang,W.K.Shen,J.M.Bai.Exchange Coupled Composite Media for Perpendicular Magnetic Recording[J].IEEE Trans.Magn.,2005,41:3181.
[8]J.P.Wang,W.K.Shen,and J.M.Bai et al,Composite media(dynamic tilted media) for magnetic recording[J].Appl.Phys.Lett.,2005,86:142504.
[9]R.H.Victora and X.Shen.Exchange coupled composite media for perpendicular magnetic recording[J].IEEE Trans.Magn.,2005,41:2828.
[10]J.U.Thiele,S.Maat,and E.E.Fullerton.FeRh/FePt exchange spring films for thermally assisted magnetic recording media[J].Appl.Phys.Lett.,2003,82,2859.
[11]Z.L.Zhao,J.S.Chen,J.Ding,J.B.Yi,B.H.Liu,and J.P.Wang.Fabrication and microstructure of high coercivity FePt thin films at 400℃[J].Appl.Phys.Lett.,2006,88,052503.
[12]F.G.Sancheza,O.C.Fesenko,O.Mryasov,R.W.Chantrell,and K.Yu.Guslienko.Exchange spring structures and coercivity reduction in FePt/FeRh bilayers:A comparison of multiscale and micromagnetic calculations[J].Appl.Phys.Lett.,2005,87:122501.
[13]R.H.Victora,and X.Shen.Composite media for perpendicular magnetic recording[J].IEEE Trans.Magn.,2005,41,537.
[14]E.Beaurepaire,J.C.Merle,A.Daunois,and J.Y.Bigot.Ultrafast spin dynamics in ferromagnetic nickel[J].Phys.Rev.Lett.1996,76:4250-4253.
[15]A.V.Kimel,A.Kirilyuk,P.A.Usachev,R.V.Pisarev,A.M.Balbashov,and Th. Rasing.Ultrafast non-thermal control of magnetization by instantaneous photomagnetic pulses[J].Nature,2005,435:655-657.
[16]T.Ogasawara and K.Ohgushi,Y.Tomioka,K.S.Takahashi,H.Okamoto,M.Kawasaki,and Y.Tokura.General Features of Photoinduced Spin Dynamics in Ferromagnetic and Ferrimagnetic Compounds[J].Phys.Rev.Lett.,2005,94:087202.
[17]C.D.Stanciu,A.V.Kimel,F.Hansteen,A.Tsukamoto,A.Itoh,A.Kirilyuk,and Th.Rasing.Ultrafast spin dynamics across compensation points in ferrimagnetic GdFeCo:The role of angular momentum compensation[J].Phys.Rev.B,2006,73:220402.
[18]M.Vomir,L.H.F.Andrade,L.Guidoni,E.Beaurepaire,and J.Y.Bigot.Real Space Trajectory of the Ultrafast Magnetization Dynamics in Ferromagnetic Metals [J].Phys.Rev.Lett.,2005,94:237601.
[19]G.Ju,A.V.Nurmikko,R.F.C.Farrow,R.F.Marks,M.J.Carey,and B.A.Gurney.Ultrafast Time Resolved Photoinduced Magnetization Rotation in a Ferromagnetic/Antiferromagnetic Exchange Coupled System[J].Phys.Rev.lett.,1999,82:3705.
[20]G.Ju,and L.Chen.Coherent magnetization rotation induced by optical modulation in ferromagnetic/antiferromagnetic exchange-coupled bilayers[J].Phys.Rev.B,2000,62:1171.
[21]M.C.Weber,H.Nembach,and J.Fassbender.All-optical probe of magnetization dynamics in exchange biased bilayers on the picosecond timescale[J].J.Appl.Phys.,2004,95:6613.
[22]G.P.Zhang,W.Hubner,E.Beaurepaire,and J.Y.Bigot.Experimental access to femtosecond spin dynamics[A].See by Spin Dynamics in Condensed Magnetic Structures I,B.Hillebrands,K.Ounadjela(Eds.),Topics Appl.Phys.,2002,83:245.