铁磁/反铁磁双层膜系统中交换各向异性及其厚度依赖性  

Thickness Dependence of Positive Exchange Bias in Ferromagnetic/Antiferromagnetic Bilayers

作　　者：许小勇[1] 顾加银[1] 孟如男[1] 李田[1] 胡经国[1] 

机构地区：[1]扬州大学物理科学与技术学院,江苏扬州225002

出　　处：《计算物理》2011年第5期786-790,共5页Chinese Journal of Computational Physics

基　　金：国家自然科学基金(10974170);扬州大学2010年科技创新培育基金和扬州大学2009;2010年大学生学术科技创新基金资助项目

摘　　要：研究铁磁/反铁磁双层膜系统中交换偏置场和矫顽场的冷却磁场依赖性.结果表明,随着冷却磁场的增加,交换偏置场由负值向正值转变.在转变点附近,矫顽场有一个特别的增强,并达到最大值.结果同相关实验一致.研究铁磁层和反铁磁层厚度对交换偏置场和矫顽场的影响.发现,正负交换偏置场和矫顽场随着铁磁层厚度的增大而减小,但随反铁磁层厚度的变化关系复杂.在正交换偏置场的情形,随反铁磁层厚度的增大,交换偏置场增强,矫顽场减弱;在负交换偏置场的情形,随反铁磁层厚度的增大,交换偏置场减弱,矫顽场增强.Cooling field dependence of exchange anisotropy was investigated in ferromagnetic （FM）/antiferromagnetic（AFM） bilayers with antiferromagnetic interface coupling. It shows that the exchange bias HE can change from negative to positive with increasing cooling field Hcf and coercivity Hc acquires a maximum near crossover of HE. Especially, effect of FM and AFM thickness on exchange anisotropy is discussed in detail. Both negative （ or positive） HE and Hc always decrease with increasing of FM thickness tFM, which shows good agreement with experimental observation. It demonstrates interfacial nature of the exchange anisotropy. However, AFM thickness tAFM dependence of exchange anisotropy is relatively complex. In the case of positive HE , with increasing of tAFM , HE increases and Hc decreases. But, in the case of negative HE, HE decreases and Hc increases with increasing tabu.

关 键 词：铁磁/反铁磁双层膜 交换偏置场 矫顽场 冷却磁场 

分 类 号：O482.51[理学—固体物理] O484.43[理学—物理]