中国物理B ›› 2008, Vol. 17 ›› Issue (4): 1443-1447.doi: 10.1088/1674-1056/17/4/049

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

The structure dependence of exchange bias in ferromagnetic/antiferromagnetic bilayers

许小勇, 王茂华, 胡经国   

  1. College of Physics Science and Technology, University of Yangzhou, Yangzhou 225002, China
  • 收稿日期:2007-09-23 修回日期:2007-11-19 出版日期:2008-04-20 发布日期:2008-04-20
  • 基金资助:
    Project supported by the National Natural Sciences Foundation of China (Grant No 10347118) and the Natural Science Foundation of Education Commission of Jiangsu Province, China (Grant No 2006KJB140133).

The structure dependence of exchange bias in ferromagnetic/antiferromagnetic bilayers

Xu Xiao-Yong(许小勇)†, Wang Mao-Hua(王茂华), and Hu Jing-Guo(胡经国)‡   

  1. College of Physics Science and Technology, University of Yangzhou, Yangzhou 225002, China
  • Received:2007-09-23 Revised:2007-11-19 Online:2008-04-20 Published:2008-04-20
  • Supported by:
    Project supported by the National Natural Sciences Foundation of China (Grant No 10347118) and the Natural Science Foundation of Education Commission of Jiangsu Province, China (Grant No 2006KJB140133).

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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. interfacial bilinear exchange coupling $J_{1}$, interfacial biquadratic (spin-flop) exchange coupling $J_{2}$ and antiferromagnetic layer thickness $t_{\rm AF}$. 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 interfacial 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.

Abstract: 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. interfacial bilinear exchange coupling $J_{1}$, interfacial biquadratic (spin-flop) exchange coupling $J_{2}$ and antiferromagnetic layer thickness $t_{\rm AF}$. 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 interfacial 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.

Key words: FM/AF bilayers, exchange coupling, exchange bias

中图分类号: 

  • 75.25.+z
75.30.Et (Exchange and superexchange interactions) 75.40.Mg (Numerical simulation studies) 75.50.Ee (Antiferromagnetics) 75.70.Cn (Magnetic properties of interfaces (multilayers, superlattices, heterostructures))