双二次耦合场对铁磁/反铁磁双层膜中交换偏置场的影响  

Effect of Biquadratic Coupling on Exchange Bias of Ferromagnetic and Antiferromagnetic Bilayer Films

作　　者：郑琳[1] 云国宏[2,3] 荣建红[3] 

机构地区：[1]包头师范学院物理系,内蒙古包头014030 [2]内蒙古师范大学物理与电子信息学院,呼和浩特010020 [3]内蒙古大学物理科学与技术学院物理系,呼和浩特010021

出　　处：《内蒙古大学学报（自然科学版）》2009年第1期46-51,共6页Journal of Inner Mongolia University：Natural Science Edition

基　　金：教育部新世纪优秀人才计划(NCET-05-0272);国家自然科学基金(10147203);国家自然科学基金(50862007);教育部科学技术研究重大项目(206024)

摘　　要：研究了界面双线性耦合和双二次耦合对铁磁/反铁磁双层膜中交换偏置场的影响.结果表明:随着双线性耦合场或双二次耦合场的增加,交换偏置场的最大值位置向易轴靠近.另外,交换偏置场随外磁场角度的变化曲线随着双二次耦合场的增加,逐渐趋于正弦图像.其根源在于双二次耦合场与铁磁层单轴各向异场二者作用相互抵消,使曲线趋于光滑.铁磁层的磁滞回线对双二次耦合场也有一定的依赖.The effects of bilinear and biquadratic terms on exchange bias of ferromagnetic and antiferromagnetic bilayer films are investigated. The results show that the maximum of the exchange bias field departs from easy axis with increasing the biquadratic-coupling field or bilinear field. In addition, the angular dependence of exchange bias gradually becomes the sine function with increasing the biquadratic-coupling field. The reason is that the effects of biquadratic-coupling field and uniaxial anisotropy of the ferromagnetic counteract each other to smooth the curves gradually. The hysteresis loops also depends on the biquadratic term.

关 键 词：铁磁/反铁磁双层薄膜 交换偏置场 双二次耦合场 外磁场角度 

分 类 号：O52[理学—高压高温物理] TM27[理学—物理]