| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Magnetic Performance of a Nanocomposite Permanent Material |
| LIU Min1**, HAN Guang-Bing2, GAO Ru-Wei2
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1Department of Electronic Science, Huizhou University, Huizhou 516007
2 School of Physics, Shandong University, Jinan 250100
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| Cite this article: |
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LIU Min, HAN Guang-Bing, GAO Ru-Wei 2011 Chin. Phys. Lett. 28 087501 |
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Abstract We build a sandwiched structure model in which the intergranular phase (IP) is homogeneously distributed between soft and hard magnetic grains, and gives a continuously anisotropic expression of the coupling part under the assumption that the IP weakens the intergrain exchange-coupling interaction. Based on the idea that the hardening mechanism is of the pinning type, we calculate the effect of the IP's thickness d and its anisotropy constant K1(0) on the intrinsic coercivity of a nanocomposite permanent material. The calculated results indicate that the domain wall goes twice through irreversible domain wall displacement during the process of moving from soft to hard magnetic grains, and the intrinsic coercivity increases with increasing d, but decreases with increasing K1(0). When d and K1(0) take 2 nm and 0.7Kh, respectively, with Kh being the anisotropy constant in the inner part of the hard magnetic grain, the calculated intrinsic coercivity is in good agreement with the experimental data.
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| Keywords:
75.50.Ww
75.30.Gw
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Received: 27 December 2010
Published: 28 July 2011
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