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HomeMaterials Science ForumMaterials Science Forum Vols. 727-728One Domain Wall Hysteresis Model for Spherical...

One Domain Wall Hysteresis Model for Spherical Grain

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Abstract:

The high uniaxial magnetic anisotropy makes phases like Nd₂Fe₁₄B, Sm₂Co₁₇, SmCo₅ or BaFe₁₂O₁₉ are very suitable as hard permanent magnetic materials. In the case of ferromagnetic materials, the global magnetostatic energy changes, according to the domain wall configuration. The simplest case to be studied is that of spherical grain with only one domain wall, in phases with uniaxial symmetry. The magnetostic energy in this system is calculated by means of Legendre polynomials. Studying the maximums and minimums of energy in this system, a simple hysteresis model can be developed. The model provides insight about the dependence of the coercive force on the grain size.

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Advanced Powder Technology VIII

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Periodical:

Materials Science Forum (Volumes 727-728)

Pages:

140-145

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.727-728.140

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Online since:

August 2012

Authors:

Marcos Flavio de Campos, José Adilson de Castro

Keywords:

Coercivity, Grain Size, Magnetostatic Energy

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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