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A study of the effective magnetic anisotropy and the corresponding spin configurations in two dimensional ferromagnetic/antiferromagnetic system |
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| Authors: | SS HongHY Kwon KM BuYZ Wu ZQ QiuC Won |
| Institution: | a Department of Physics, Kyung Hee University, Seoul 130-701, Republic of Korea b Department of Physics, Fudan University, Shanghai 200433, People''s Republic of China c Department of Physics, University of California at Berkeley, Berkeley, CA 94720, USA |
| Abstract: | The spin configurations of two dimensional ferromagnetic/antiferromagnetic system were investigated using model calculations and Monte-Carlo simulation methods. The lowest energy state was obtained under various coupling conditions to investigate the role of interfacial interaction on anisotropy. We found that the total ferromagnetic layer anisotropy is contributed not only from its own crystalline anisotropy but also from the antiferromagnetic layer spin flop effect. The overall ferromagnetic layer effective anisotropy is calculated as a function of the exchange energy of antiferromagnetic layer and the interfacial interaction energy. If the effective anisotropy from the spin flop effect is comparable with the crystalline anisotropy, the asymmetric spin configuration is generated. In this configuration, the magnetization direction of the ferromagnetic layer is neither perpendicular nor parallel to the antiferromagnetic spin direction. Temperature effect on the perpendicular-to-collinear coupling transition was also investigated using Monte-Carlo simulation, and the relationship between the effective anisotropy and the temperature was obtained. |
| Keywords: | Magnetic anisotropy Interfacial coupling Spin reorientation transition |
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