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Critical phenomenon in soft magnetic properties of giant magnetostrictive materials: Computer simulation


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Title: Critical phenomenon in soft magnetic properties of giant magnetostrictive materials: Computer simulation
Authors: Fukunaga, Hirotoshi / Yamaguchi, Takayuki
Issue Date: Apr-2006
Publisher: American Institute of Physics
Citation: Journal of Applied Physics, 99(8), 08M709; 2006
Abstract: Dependence of magnetostrictive and magnetic properties on grain size was calculated numerically for an isotropic giant magnetostrictive material. The model magnet assumed is composed of 8000 cubic (Tb0.3Dy0.7)Fe2 grains. The direction of magnetization and the magnetostriction of each grain was determined for a given applied field under the consideration of the anisotropy, exchange, magnetoelastic, elastic, and Zeeman energies. Subsequently, the hysteresis loop and the magnetostriction versus applied field curve was obtained by varying the applied field. With decreasing the grain size D, the coercivity Hc and dλ/dH, where λ is the magnetostriction, decreased abruptly at D=25 nm. This improvement in soft magnetic properties exceeded the expected improvement from Herzer's calculation, in which Hc was proportional to D6. In order to study the significant improvement in detail, we calculated magnetic and magnetostrictive properties with varying magnetostriction and anisotropy constants. Resultantly, it was clarified that the critical phenomenon occurs when the total of elastic and magnetoelastic energies exceed the magnetic anisotropy energy in magnitude. (c)2006 American Institute of Physics
URI: http://hdl.handle.net/10069/21942
ISSN: 00218979
DOI: 10.1063/1.2176311
Relational Links: http://link.aip.org/link/?JAPIAU/99/08M709/1
Rights: Copyright (2006) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in J. Appl. Phys. 99, 08M709 (2006) and may be found at http://link.aip.org/link/?JAPIAU/99/08M709/1
Type: Journal Article
Text Version: publisher
Appears in Collections:Articles in academic journal

Citable URI : http://hdl.handle.net/10069/21942

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