Effect of exchange coupling on magnetic property in Sm–Co/α-Fe layered system  

作　　者：桑成祥 赵国平 夏卫星 万秀琳 F J Morvan 张溪超 谢林华 张健 杜娟 闫阿儒 刘平 

机构地区：[1]College of Physics and Electronic Engineering Sichuan Normal University [2]Key Laboratory of Magnetic Materials and Devices Ningbo Institute of Material Technology and EngineeringChinese Academy of Sciences [3]Department of Physics University of Texas at Arlington

出　　处：《Chinese Physics B》2016年第3期380-386,共7页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.11074179 and 10747007);the National Basic Research Program of Chi(Grant No.2014CB643702);the Zhejiang Provincial Natural Science Foundation of China(Grant No.LY14E010006);the Construction Plan for Scientif Research Innovation Teams of Universities in Sichuan Province,China(Grant No.12TD008);the Scientific Research Foundation for the Returned Overse Chinese Scholars of the Education Ministry,China;the Program for Key Science and Technology Innovation Team of Zhejiang Province,China(Gra No.2013TD08)

摘　　要：The hysteresis loops as well as the spin distributions of Sm-Co/a-Fe bilayers have been investigated by both three- dimensional （3D） and one-dimensional （1D） micromagnetic calculations, focusing on the effect of the interface exchange coupling under various soft layer thicknesses ts. The exchange coupling coefficient Alas between the hard and soft ,layers varies from 1.8 x10-6 erg/cm to 0.45 x 10-6 erg/cm, while the soft layer thickness increases from 2 nm to 10 nm. As the exchange coupling decreases, the squareness of the loop gradually deteriorates, both pinning and coercive fields rise up monotonically, and the nucleation field goes down. On the other hand, an increment of the soft layer thickness leads to a significant drop of the nucleation field, the deterioration of the hysteresis loop squareness, and an increase of the remanence. The simulated loops based on the 3D and 1D methods are consistent with each other and in good agreement with the measured loops for Sm-Co/a-Fe multilayers.The hysteresis loops as well as the spin distributions of Sm-Co/a-Fe bilayers have been investigated by both three- dimensional （3D） and one-dimensional （1D） micromagnetic calculations, focusing on the effect of the interface exchange coupling under various soft layer thicknesses ts. The exchange coupling coefficient Alas between the hard and soft ,layers varies from 1.8 x10-6 erg/cm to 0.45 x 10-6 erg/cm, while the soft layer thickness increases from 2 nm to 10 nm. As the exchange coupling decreases, the squareness of the loop gradually deteriorates, both pinning and coercive fields rise up monotonically, and the nucleation field goes down. On the other hand, an increment of the soft layer thickness leads to a significant drop of the nucleation field, the deterioration of the hysteresis loop squareness, and an increase of the remanence. The simulated loops based on the 3D and 1D methods are consistent with each other and in good agreement with the measured loops for Sm-Co/a-Fe multilayers.

关 键 词：hysteresis loops exchange coupling MICROMAGNETICS hard/soft bilayers 

分 类 号：TM27[一般工业技术—材料科学与工程]