The magnetization behavior of nanocrystalline permanent magnets based on the Stoner–Wohlfarth Model |
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Authors: | Hong-wei Zhang, Shao-ying Zhang, Bao-gen Shen,Helmut Kronmü ller |
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Affiliation: | a State Key Laboratory of Magnetism, Institute of Physics, Centre for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China b Max-Planck-Institut für Metallforschung, D-70569, Stuttgart, Germany |
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Abstract: | The magnetization behavior in nanocrystalline permanent magnets has been investigated using mean field Stoner–Wohlfarth model. The model is comparatively simple but allows the numerical treatment of extended nanostructures. The predominant intergrain exchange coupling is expressed by a mean field constant Nm in spite of no explicit relationship between Nm and the microstructure. By this model, the experimental phenomena, such as the remanence enhancement, the shape of demagnetization curve, the irreversible magnetization, the exchange bias field and their respective temperature dependence, can be well explained. The Nm dependence of magnetic properties has been extensively discussed in the present paper. |
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Keywords: | Intergrain exchange coupling Coercivity Remanence enhancement |
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