Coercivity, time dependence and reversible magnetization in Nd rich Nd-Fe-B alloys

Author

Woodward, Robert C. ; Gorham, Nicole T. ; Street, Robert ; Crew, David C. ; Girt, Erol ; Krishnan, Kannan M.

Author_Institution

Dept. of Phys., Western Australia Univ., Nedlands, WA, Australia

Volume

37

Issue

4

fYear

2001

fDate

7/1/2001 12:00:00 AM

Firstpage

2493

Lastpage

2496

Abstract

The coercivity, time dependent magnetic properties and reversible magnetization behavior for a series of neodymium enriched alloys based on Nd₂Fe₁₄B has been investigated. These studies were carried out in an attempt to elucidate the dramatic increase in the coercivity in these materials with increasing dilution of the magnetic phase (Nd₂Fe₁₄B). Good correlation between the coercivity and the relative average linear sparing between magnetic grains was found for all but the lowest Nd content. As the Nd content is increased the reversible magnetization associated with domain wall pinning decreases. At high dilutions the reversible magnetization behavior is consistent with the predictions of a Stoner-Wohlfarth model of an assembly of noninteracting single domain particles. The magnetic viscosity parameter, Λ, does not vary consistently with dilution or coercivity

Keywords

boron alloys; coercive force; ferromagnetic materials; iron alloys; magnetic aftereffect; magnetic domain walls; magnetisation reversal; neodymium alloys; Nd-Fe-B alloy; Nd₂Fe₁₄B; Stoner-Wohlfarth model; coercivity; domain wall pinning; magnetic phase dilution; magnetic properties; magnetic viscosity; reversible magnetization; time dependence; Assembly; Coercive force; Iron alloys; Magnetic domain walls; Magnetic domains; Magnetic materials; Magnetic properties; Magnetization; Neodymium; Predictive models;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.951213

Filename

951213