Coercivity and magnetic viscosity of NdDyFeB mechanically alloyed magnets

Author

Villas-Boas, V. ; González, J.M. ; Cebollada, F. ; Rossignol, M.F. ; Taylor, D.W. ; Givord, D.

Author_Institution

Inst. de Fisica, Sao Paulo Univ., Brazil

Volume

31

Issue

6

fYear

1995

fDate

11/1/1995 12:00:00 AM

Firstpage

3647

Lastpage

3649

Abstract

We studied the temperature dependence of coercivity and magnetic viscosity in NdDyFeB mechanically alloyed magnets for temperatures between 25 and 500 K. The results are discussed in terms of the so-called global model of coercivity which provides information about the magnetic properties in the activation magnetization volume ν_a where magnetization reversal is initiated. The anisotropy increase as well as the reduction of the magnetization associated with the substitution of Dy for Nd are factors leading to the enhancement of the coercive field. However, the contribution of microstructural features should also be considered

Keywords

boron alloys; coercive force; crystal microstructure; dysprosium alloys; ferromagnetic materials; iron alloys; magnetic anisotropy; magnetic permeability; magnetisation reversal; magnetocaloric effects; mechanical alloying; neodymium alloys; permanent magnets; 25 to 500 K; NdDyFeB; coercivity; global model; magnetic anisotropy; magnetic viscosity; magnetization reversal; magnetization volume; mechanically alloyed magnets; microstructure; temperature dependence; Anisotropic magnetoresistance; Coercive force; Magnetic anisotropy; Magnetic properties; Magnetization reversal; Magnets; Neodymium; Perpendicular magnetic anisotropy; Temperature dependence; Viscosity;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.489597

Filename

489597