脉冲激光沉积(La(0．2)Bi(0．8)FeO3)(0．8)-(NiFe2O4)(0．2)薄膜及其多铁性能研究  

Multiferroic Properties of(La_(0.2)Bi_(0.8)FeO_3)_(0.8)-(NiFe_2O_4)_(0.2)Films Grown by Pulse Laser Deposition

作　　者：李享成[1] 杨光[1] 戴能利[1] 陈爱平[1] 龙华[1] 姚凯伦[2] 陆培祥[1] 

机构地区：[1]华中科技大学武汉光电国家实验室激光科学与技术研究部 [2]华中科技大学物理系,武汉430074

出　　处：《无机材料学报》2008年第5期897-901,共5页Journal of Inorganic Materials

基　　金：国家自然科学基金(10604018);高等学校博士学科点专项科研基金(20060487006)

摘　　要：采用脉冲激光沉积法,在(100)SrTiO_3基底上,制备了(La_(0.2)Bi_(0.8)FeO_3)_(0.8)-(NiFe_2O_4)_(0.2)(LBFO-NFO)多铁薄膜,通过X射线衍射仪和场发射扫描电子显微镜确定了LBFO-NFO多铁薄膜的显微结构,通过标准铁电测试系统(RT-66A)和振动样品磁强计(VSM)分别测试了LBFO-NFO多铁薄膜的铁电性能和铁磁性能.研究发现:多铁薄膜中LBFO和NFO二相均沿(100)方向外延生长,晶粒尺寸在100～150nm之间;薄膜具有明显的电滞回线(P_=7.6μC/cm^2)和磁滞回线(M_s=4.12×10~4A/m),显示出明显的铁电铁磁共存特性.通过对薄膜生长条件的控制,可削除杂质相,减小LBFO-NFO薄膜的漏电流,提高铁电及铁磁性能.（La0.2Bi0.8FeO3）0.8-（NiFe2O4）0.2 （LBFO-NFO） thin films were grown on （100） SrTiO3 substrates by pulse laser deposition . X-ray diffraction and Field Emission Scanning Electronic Microgrape studies confirm that the phases of LBFO and NFO in the films grow along the direction of （100） and the particle sizes of the two phases are about 100-150nm, respectively. The ferroelectrie and ferromagnetic hysteresis of the films measured with a standardized ferroelectric test system （RT- 66A, Radiant technologies） and vibrating sample magnetometer （VSM） show that the saturation polarization and magnetization are 7.6uC/cm^2 and 4.12×10^4A/m respectively, which indicates that LBFO-NFO films possess multiferroic properties obviously. By controlling the growth condition of the films, the leakage current of LBFO-NFO films can be decreased. Accordingly, the ferroelectrie and ferromagnetic properties can be enhanced greatly.

关 键 词：多铁薄膜 外延生长 脉冲激光沉积 漏电流 

分 类 号：O48[理学—固体物理] TM28[理学—物理]