缺损钴纳米环磁特性模拟研究
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摘要
利用蒙特卡洛(MC)方法结合快速傅立叶变换微磁学(FFTM)方法,研究了缺损钴纳米环材料的磁特性,模拟结果表明:缺损钴纳米环的磁滞回线依然存在典型的双稳态特征.当缺损纳米环中的内半径变化时,在外磁场的作用下依然存在着洋葱态和涡旋态,但在外磁场变化过程中出现了多次局部涡旋的过渡状态,随着缺损程度的变化,其磁化行为也发生变化.
Base on the Monte Carlo simulation and fast Fourier transformation micro-magnetism method,the magnetic properties of Co nanorings with different defect are studied. The simulation results show that bistable state can be observed in Co nanoring with different defect degree. The systems still exist"vortex"state and"onion"state when we change the inside radius,and more transition state can be observed in the system. The magnetization behavior changes with changing defect degree of nanoring.
Base on the Monte Carlo simulation and fast Fourier transformation micro-magnetism method,the magnetic properties of Co nanorings with different defect are studied. The simulation results show that bistable state can be observed in Co nanoring with different defect degree. The systems still exist"vortex"state and"onion"state when we change the inside radius,and more transition state can be observed in the system. The magnetization behavior changes with changing defect degree of nanoring.
引文
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[2]KIM D O,RYEOL LEE D,CHOI Y,et al.Inducing vortex formation in multilayered circular dots using remanent curves[J].Appl Phys Lett,2012,101:192404-1-4.
[3]COWBURN R P.Property variation with shape in magnetic nanoelements[J].J Phys D,2000,33(1):R1-R16.
[4]GUBBIOTTI G,TACCHI S,MADAMI M,et al.Collective spin waves in a bicomponent two-dimensional magnonic crystal[J].Appl Phys Lett,2012,100:162407-1-5.
[5]NGUYEN H T,COTTAM M G.Theory of spin-wave instability thresholds for ultrathin ferromagnetic films under parallel pumping[J].Phys Rev B,2014,89(14):162-169.
[6]MONTICONE I F,AL U'A.The quest for optical magnetism:from split-ring resonators to plasmonic nanoparticles and nanoclusters[J].J Mater Chem C,2014,2(43):9059-9072.
[7]SHINJO T,OKUNO T,HASSDORF R T,et al.Magnetic vortex core observation in circular dots of permalloy[J].Science,2000,289(5481):930-932.
[8]CHEN R,RONG C B,ZHANG H W,et.al.Micromagnetic analysis of the magnetization reversal processes in Sm(Co,Cu,Fe,Zr)z magnets Sm(Co,Cu,Fe,Zr)z[J].Acta,Physica Sinica,2004,53(12):4341-4346.
[9]习小文.铁磁构件应力磁化及反转效应的数值模拟与试验研究[D].南昌:南昌航空大学,2015.
[10]苗秀娟,王学凤,蓝志环.含有缺口的Co纳米环的微磁学模拟[J].磁性材料及器件,2012(1):24-26.
[11]何淑婷.纳米线(环)的微磁学计算模拟[D].兰州:兰州大学,2012.
[12]KUMAR N,VENKAT G,PRABHAKAR A.An iterative solution for spin-wave dispersion in a magnonic ring[J].IEEE Trans Magn,2014,50(9):1-6.
[13]CHO K,LOGET G,CORN R M.Lithographically patterned nanoscale electrodeposition of plasmonic,bimetallic,semiconductor,magnetic,and polymer nanoring arrays[J].J Phys Chem C,2014,118(50):8993-2900.
[14]KLAUI M,ROTHMAN J,LOPEZ-DIAZ L,et al.Vortex circulation control in mesoscopic ring magnets[J].Appl Phys Lett,2001,78(21):3268-3270.
[15]YE Qingying,CHEN Shuiyuan,LIU Jingyao,et al.Study of magnetic properties for Co double-nanorings:monte crlo simulation[J].Journal of Magnetism and Magnetic Materials,2016,408:1–6.
[16]林枝钦.纳米环的磁特性的数值计算[D].福州:福建师范大学,2009.
[17]钟克华,冯倩,翁臻臻,等.快速傅立叶变换微磁学方法[J].计算物理,2005,22(6),534-538.