铁磁材料界面磁耦合表面格林函数方法  

A SURFACE-GREEN'S-FUNCTION METHOD OF INTERFACE EXCHANGE MAGNETIC COUPLING OF FERROMAGNETIC MATTER

作　　者：郑勇林[1,2] 葛泽玲[2] 包秀丽[2] 郭红力[2] 杨维[1] 程浩[1] 刘鸿[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》2012年第5期375-379,共5页Low Temperature Physical Letters

基　　金：重庆市教委科学技术研究项目(批准号:KJ061305;KJ081307)资助的课题~~

摘　　要：基于表面格林函数理论,考虑二维平移对称,通过紧束缚线性糕模轨道(TB-LMTO)表面格林函数方法和完全避开一般的块格林函数方法(GF)方法,研究了铁磁材料界面磁耦合,以Co/Cu/Co的3层膜为例,对铁磁体之间的层间交换耦合作用进行了讨论.研究表明:磁性多层结构交换耦合振荡依赖于夹层厚度,当磁性层厚度改变,单独RKKY势的贡献显著的依赖于界面耦合.这结论与一种从头计算方法,在磁性多层膜中评价交换振荡耦合的结果相一致.Based on a theory of surface Green＇s function, consider the two-dimensional translational symmetry, through the tight-binding linear muffin-tin orbital （TB-LMTO） and surface Green＇s function method. It is studies the magnetic coupling of ferromagnetic material interface and it is discussed the ferromagnetic exchange coupling be- tween the layer for Co/Cu/Co 3-layer film, for example. The research have shown that the exchange coupling oscil- lations depends thickness of the magnetic multi-layer structure interlayer. The contribution of individual RKKY po- tential depends interface coupling when the interlayer thickness change. It is found that a conclusion is consistent with the results of the ab initio method in the in the evaluation of magnetic multilayers exchange coupled oscillation.

关 键 词：铁磁材料 夹层结构 界面交换磁耦合 格林函数近似 

分 类 号：O482.5[理学—固体物理]