The structure dependence of exchange bias in ferromagnetic/antiferromagnetic bilayers  

作　　者：许小勇 王茂华 胡经国 

机构地区：[1]College of Physics Science and Technology,University of Yangzhou

出　　处：《Chinese Physics B》2008年第4期1443-1447,共5页中国物理B（英文版）

基　　金：Project supported by the National Natural Sciences Foundation of China (Grant No 10347118);the Natural Science Foundation of Education Commission of Jiangsu Province,China (Grant No 2006KJB140133)

摘　　要：The structure dependence of exchange bias in ferromagnetic/antiferromagnetic （FM/AF） bilayers has been investigated in detail by extending Slonczewski＇s ＇proximity magnetism＇ idea. Here three important parameters are discussed for FM/AF bilayers, i.e. interracial bilinear exchange coupling J1, interracial biquadratic （spin-flop） exchange coupling J2 and antiferromagnetic layer thickness tAF. The results show that both the occurrence and the variety of the exchange bias strongly depend on the above parameters. More importantly, the small spin-flop exchange coupling may result in an exchange bias without the interracial bilinear exchange coupling. However, in general, the spin-flop exchange coupling cannot result in the exchange bias. The corresponding critical parameters in which the exchange bias will occur or approach saturation are also presented.The structure dependence of exchange bias in ferromagnetic/antiferromagnetic （FM/AF） bilayers has been investigated in detail by extending Slonczewski＇s ＇proximity magnetism＇ idea. Here three important parameters are discussed for FM/AF bilayers, i.e. interracial bilinear exchange coupling J1, interracial biquadratic （spin-flop） exchange coupling J2 and antiferromagnetic layer thickness tAF. The results show that both the occurrence and the variety of the exchange bias strongly depend on the above parameters. More importantly, the small spin-flop exchange coupling may result in an exchange bias without the interracial bilinear exchange coupling. However, in general, the spin-flop exchange coupling cannot result in the exchange bias. The corresponding critical parameters in which the exchange bias will occur or approach saturation are also presented.

关 键 词：FM/AF bilayers exchange coupling exchange bias 

分 类 号：O484.43[理学—固体物理]