Pt插层对Co/FeMn界面的影响  

Effect of Pt spacers on the interface of Co/FeMn

作　　者：付艳强[1] 刘洋[1] 金川[1] 于广华[1] 

机构地区：[1]北京科技大学材料物理与化学系,北京100083

出　　处：《物理学报》2009年第11期7977-7982,共6页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:50831002;50871014;50671008)资助的课题~~

摘　　要：采用磁控溅射的方法制备了Co/FeMn/Co多层膜,研究了Co(底部)/FeMn和FeMn/Co(顶部)界面插入Pt层后磁矩的变化情况.通过测量磁滞回线可知,Co(底部)/FeMn界面的Pt插层改变了体系的饱和磁化强度Ms,随着Co层厚度(tCo)的增加Ms不断趋近于Co块体结构理论值1440kA/m.这是因为Co(底部)/FeMn界面产生了净磁矩,而界面处的Pt插层可以减少这种净磁矩的产生.但是,FeMn/Co(顶部)界面却表现出了与Co(底部)/FeMn界面不同的性质,其界面的Pt插层对磁矩影响很小.Co/FeMn/Co multilayers were prepared by magnetron sputtering. The change of magnetic moments by insertion of Pt spacer at the Co （bottom）/FeMn interface and FeMn/Co （top） interface has been investigated. According to the hysteresis loops measured by alternating gradient magnetometer （AGM）, the saturation magnetization （M_s） of multilayers is changed by the Pt spacer at the Co （bottom）/FeMn interface, and there is an asymptotic approach of M_s to the theoretical value of M_s of the cobalt bulk of 1440 kA/m as the thickness of Co layer （t_Co） is increased. This behavior is due to the production of net magnetic moments at the Co （bottom）/FeMn interface, which are decreased by Pt spacer at the Co （bottom）/FeMn interface. However, a significant difference between the Co （bottom）/FeMn interface and the FeMn/Co （top） interface is observed, as little influence of the Pt spacer on magnetic moments is shown when inserted at the FeMn/Co （top） interface.

关 键 词：磁性多层膜 垂直磁各向异性 交换耦合 

分 类 号：O484.43[理学—固体物理]