晶体畴反转过程中畴壁运动与极化电流特性研究
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摘要
为了解晶体畴反转的动力学过程,利用马赫-曾德干涉实验系统,研究了外电场极化下掺镁铌酸锂和纯净铌酸锂晶体在畴反转过程中的畴壁运动和极化电流特性。实时记录了掺镁7 mol%、掺镁5 mol%铌酸锂和纯净铌酸锂晶体在畴反转过程中的畴壁特征和极化电流变化情况,发现离散的畴壁速度脉冲伴随着离散的极化电流脉冲,连续的畴壁速度脉冲对应着连续的极化电流脉冲。掺镁铌酸锂晶体正向反转和纯净铌酸锂反向反转的畴壁速度变化和极化电流变化比较尖锐,而掺镁铌酸锂晶体反向反转和纯净铌酸锂正向反转的畴壁速度变化和极化电流变化比较缓和。最后对实验现象进行了解释。
To understand the dynamics feature of ferroelectric domains inversion,a Mach-Zehnder interference system was set up to study the characteristics of domain wall motion and polarization current in domains inversion process in pure LiNbO3 and in MgO-doped LiNbO3 under electric field polarizing.The domain wall patterns and the polarization current were recorded in real-time in domains inversion process for 7 mol%MgO-doped LiNbO3,5 mol% MgO-doped LiNbO3and pure LiNbO3.It was found that discrete domain-wall velocity pulse corresponds to a discrete polarized current pulses and continuous domain wall velocity pulse corresponds to the continuous polarized current pulses as well.Domain wall motion and polarization current of the forward inversion of MgO-doped LiNbO3 and the reverse inversion of pure LiNbO3 change sharperly.But domain wall motion and polarization current of the reverse inversion of MgO-doped LiNbO3 and the forward inversion of pure LiNbO3 change moderately.The experiment results are explained.
To understand the dynamics feature of ferroelectric domains inversion,a Mach-Zehnder interference system was set up to study the characteristics of domain wall motion and polarization current in domains inversion process in pure LiNbO3 and in MgO-doped LiNbO3 under electric field polarizing.The domain wall patterns and the polarization current were recorded in real-time in domains inversion process for 7 mol%MgO-doped LiNbO3,5 mol% MgO-doped LiNbO3and pure LiNbO3.It was found that discrete domain-wall velocity pulse corresponds to a discrete polarized current pulses and continuous domain wall velocity pulse corresponds to the continuous polarized current pulses as well.Domain wall motion and polarization current of the forward inversion of MgO-doped LiNbO3 and the reverse inversion of pure LiNbO3 change sharperly.But domain wall motion and polarization current of the reverse inversion of MgO-doped LiNbO3 and the forward inversion of pure LiNbO3 change moderately.The experiment results are explained.
引文
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[3]STEIGERWALD H,YING Y J,EASON R W,et al.Direct writing of ferroelectric domains on the x-and y-faces of lithiumniobate using a continuous wave ultraviolet laser[J].Appl Phys Lett,2011,98(6):092902-1-3.
[4]MuLLER M,SOERGEL E,BUSE K.Influence of ultraviolet illumination on the poling characteristics of lithium niobatecrystals[J].Appl Phys Lett,2003,83(9):1824-1826.
[5]YAMADA M,NADA N,SAITOH M,WATANABE,et al.First-order quasi-phase matched LiNbO3 waveguide periodicallypoled by applying an external field for efficient blue second-harmonic generation[J].Appl Phys Lett,1993,62(5):435-436.
[6]MYERS L E,ECKARDT R C,FEJER M M,et al.Quasi-phase-matched optical parametric oscillators using bulk periodi-cally poled LiNbO3[J].J Opt Soc Am B,1995,12(11):2102-2116.
[7]陈云琳,许京军,宋峰,等.外加电场极化法制备LiNbO3周期性畴反转的工艺研究[J].光学学报,2001,21(5):618-620.
[8]CHOUDHURY S,LI Y L,ODAGAWA N,et.al.The influence of 180°ferroelectric domain wall width on the thresholdfield for wall motion[J].J Appl Phys,2008,104(8):084107-1-7.
[9]ZHI Y N,LIU D A,SUN J F,et al.Phase mapping of domain kinetics in lithium niobate by digital holographic interfer-ometry[J].J Appl Phys,2009,105(2):024106-1-8.
[10]SHIN Y H,GRINBERG I,CHEN I W,et al.Nucleation and growth mechanism of ferroelectric domain-wall motion[J].Nature,2007,449:881-885.
[11]ELISEEV E A,MOROZOVSKA A N,KALININ S V,et al.Surface effect on domain wall width in ferroelectrics[J].JAppl Phys,2009,106(8):084102-1-6.
[12]SHI Y P,HONG L,SOH A K.Time-dependent three-dimensional domain reverse mechanism in nucleation,growth,andbreakdown of ferroelectric films[J].J Appl Phys,2010,107(12):124114-1-5.
[13]GOPALAN V,MITCHELL T E,SICAKFUS K E.Switching kinetics of 180°domains in congruent LiNbO3and LiTaO3crys-tals[J].Solid State Comm,1999,109:111-117.
[14]GOPALAN V,JIA Q X,MITCHELL T E.In situ video observation of 180°domain kinetics in congruent LiNbO3 crystals[J].Appl Phys Lett,1999,75(16):2482-2484.
[15]GOPALAN V,MITCHELL T E.Wall velocities,switching times,and the stabilization mechanism of 180°domains in con-gruent LiTaO3 crystals[J].J Appl Phys,1998,83(2):941-954.
[16]GOPALAN V,GUPTA M C.Origin of internal fields and visualization of 180°domains in congruent LiTaO3 crystals[J].JAppl Phys,1996,80(11):6099-6106.
[17]GOPALAN V,MITCHELL T E,FURUKAWA Y,et al.The role of nonstoichiometry in 180°domain switching in LiNbO3crystals[J].Appl Phys Lett,1998,72(16):1981-1983.
[18]GRANZOW T,DORFLER U,WOIKE T,et al.Influence of pinning effects on the ferroelectric hysteresis in cerium-dopedSr0.61Ba0.39Nb2O6[J].Phys Rev B,2001,63(17):174101-1-7.