铁磁/反铁磁双层膜中自旋波交换偏置的理论与实验分析  

THEORY AND EXPERIMENT ANALYSE OF SPIN-WAVE EXCHANGE BIAS IN FERROMAGNET/ANTIFERROMAGNET BILAYERS

作　　者：谭健敏[1] 郑勇林[1,2] 卢孟春[2] 包秀丽[2] 郭红霞[1] 

机构地区：[1]成都大学电子信息工程学院,四川成都610106 [2]长江师范学院凝聚态物理研究所,重庆408100

出　　处：《低温物理学报》2016年第2期91-94,共4页Low Temperature Physical Letters

基　　金：国家自然科学基金(批准号:11205022);重庆市教委科学技术研究(KJ061305;KJ131319)资助的课题

摘　　要：考虑铁磁/反铁磁界面粗糙度的随机性及局域外单向的界面能的随机性,考虑原子尺度在交换偏置强度上的至关作用,提出随机场效应概念.对(Fe/FeF2)研究表明,交换偏置和自旋波线宽频率在铁磁/反铁磁双层界面是依赖于外部磁场的.应用玻恩近似,计算了交换偏置对随机场的依赖,由于界面的粗糙度,证明了在反铁磁层出现时在界面自旋波线宽的增加,但自旋波随机场线宽随着外磁场增加而减小,在较大的外场下,从实验能观察到扩展的峰.Base on a randomly of the roughness at interface of FM/AFM, and which is random on atomic scale plays crucial role in determining the strength of the exchange bias, put forward a concept for effect of random field. It is show that is used to explain the dependence of spin-wave linewidth （frequency）, and of the exchange bias ferromagnetic layer in thin ferromagnetic （FM）/antiferromagnetic bilayer （FM/AFM） （Fe/FeF2） as a function of external field. Field-dependent the exchange bias is calculated by Born approximation. A random field, due to roughness at interface, is invoked to explain the large broadening of the spinwave mode when the AFM layer is present, the linewidth random fields should decrease with external field increase. For a magnitude of external field, we have a peak in broadening that can also be observed in experimental.

关 键 词：铁磁 反铁磁 自旋波函数 线宽 交换偏置 

分 类 号：O469[理学—凝聚态物理]