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Numerical Study of Enhanced Coercivity of a Magnetically Hard Grain with Thin Surface Layers due to Antiferromagnetic Coupling


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Title: Numerical Study of Enhanced Coercivity of a Magnetically Hard Grain with Thin Surface Layers due to Antiferromagnetic Coupling
Authors: Fukunaga, Hirotoshi / Yokoi, Yuji / Nakano, Masaki / Yanai, Takeshi
Issue Date: Nov-2012
Publisher: Institute of Electrical and Electronics Engineers Inc.
Citation: IEEE Transactions on Magnetics, 48(11), pp.3162-3165; 2012
Abstract: The effects of a thin ferromagnetic layer covering a magnetically hard grain on the coercivity were calculated based on micromagnetic theory. Antiferromagnetic exchange coupling between this thin ferromagnetic surface layer (SF layer) and the hard grain was found to prevent nucleation of reverse domains at the surface of the hard grain and to increase the coercivity. This was effective for hard grains with a layer of reduced magnetic anisotropy on their surfaces whose thickness is comparable with the exchange length. It was also found that a SF layer thickness of several nanometers is suitable. The effects were simulated for a hard grain with SF layers coupled both ferromagnetically and antiferromagnetically. It was found that the coercivity can be enhanced by antiferromagnetically coupled SF layers lying parallel to the easy magnetization axis of the hard grain.
Keywords: Antiferromagnetic coupling / Coercive force / Exchange coupling / Nucleation / Permanent magnet
URI: http://hdl.handle.net/10069/30995
ISSN: 00189464
DOI: 10.1109/TMAG.2012.2201707
Rights: © 2012 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Type: Journal Article
Text Version: author
Appears in Collections:Articles in academic journal

Citable URI : http://hdl.handle.net/10069/30995

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