Portal de Periódicos da CAPES

Artigo Produção Nacional Revisado por pares

BIBTEX RIS

Effect of Grain Size on the Coercivity of Sintered NdFeB Magnets

2010; Trans Tech Publications; Volume: 660-661; Linguagem: Inglês

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

1662-9760

Marcos Flávio de Campos,

Magnetic properties of thin films

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.