Exchange bias for ferromagnetic/antiferromagnetic bilayers with the uniaxial anisotropy being misaligned with the exchange anisotropy |
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Authors: | YuHao Bai and GuoHong Yun |
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Institution: | (1) National Laboratory of Solid State Microstructures, Nanjing University, 210093 Nanjing, PR China;(2) College of Physics Science and Technology, Yangzhou University, 225002 Yangzhou, PR China; |
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Abstract: | Using the principle of minimal energy and S-W model, the exchange bias for ferromagnetic/antiferromagnetic bilayers has been
investigated when the uniaxial anisotropy is misaligned with the exchange anisotropy. According to the relation between the
energy of the bilayer and the orientation of ferromagnetic magnetization, it is found that the bilayer will be in the monostable
state or bistable state when the external field is absent in the initial magnetization state. The monostable state or bistable
state of the bilayer, which determines the angular dependence of exchange bias directly, is controlled by the competition
between the exchange anisotropy and uniaxial anisotropy. When the applied field is parallel to the intrinsic easy axes and
intrinsic hard axes, one of the switching fields of the hysteresis loop shows an abrupt change, while the other keep continuous
by analyzing the magnetization reversal processes. Consequently, the exchange bias field and the coercivity will show a jump
phenomenon. The numerical calculations indicate that both the magnitude and direction of the exchange anisotropy will significantly
affect the angular dependence of exchange bias. The jump phenomenon of exchange bias is an intrinsic property of the bilayer,
which is dependent on the interfacial exchange-coupling constant, the orientation of the exchange anisotropy, the thickness
and uniaxial anisotropy constant of the ferromagnetic layer. |
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Keywords: | |
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