Effect of Grain Size on the Coercivity of Sintered NdFeB Magnets

Abstract:

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Sintered NdFeB magnets typically exhibit grain size above 2 micrometers, a value above the single domain particle size (~0.3 micrometers). It is discussed how to obtain relationships between grain size and coercivity with energy balance models, considering formation and annihilation of domain walls as a dissipative process. In the case of nanocrystaline magnets, the Stoner-Wohlfarth model is very suitable. For larger grain sizes, the contribution of the magnetostatic energy of each grain has to be considered. From the concept of meta-stability of domains and domain walls structure, a relation between coercive field and grain size can be estimated.

Info:

Periodical:

Materials Science Forum (Volumes 660-661)

Edited by:

Lucio Salgado and Francisco Ambrozio Filho

Pages:

284-289

DOI:

10.4028/www.scientific.net/MSF.660-661.284

Citation:

M. F. de Campos "Effect of Grain Size on the Coercivity of Sintered NdFeB Magnets", Materials Science Forum, Vols. 660-661, pp. 284-289, 2010

Online since:

October 2010

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Price:

$35.00

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