Evidence for the presence of a soft magnetic layer on the surface of die upset melt quenched Nd-Fe-B

Author

Sun, Hong ; Woodward, R.C. ; Stamps, R. ; Street, R.

Author_Institution

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

Volume

35

Issue

5

fYear

1999

fDate

9/1/1999 12:00:00 AM

Firstpage

3280

Lastpage

3282

Abstract

Magnetic properties on the surface of the anisotropic melt quenched Nd-Fe-B material were studied and compared with the properties of the material in bulk. The coercive field is 10.3 kOe on the surface and 14.9 kOe in the bulk. The reversible susceptibility is much higher and the irreversible susceptibility is much lower on the surface than in the bulk. Open recoil loops on the surface are observed. The lower coercive field and higher reversible susceptibility are due to the presence of a soft magnetic phase on the surface. Open recoil loops are due to exchange coupling between the soft magnetic phase on the surface and the hard magnetic phase in the bulk material

Keywords

boron alloys; coercive force; exchange interactions (electron); iron alloys; magnetic susceptibility; neodymium alloys; permanent magnets; soft magnetic materials; surface magnetism; Nd-Fe-B; bulk hard magnetic phase; coercive field; die upset anisotropic melt quenched material; exchange coupling; irreversible susceptibility; open recoil loops; reversible susceptibility; surface magnetic properties; surface soft magnetic layer; Anisotropic magnetoresistance; Magnetic anisotropy; Magnetic domains; Magnetic field measurement; Magnetic force microscopy; Magnetic materials; Magnetization; Message-oriented middleware; Perpendicular magnetic anisotropy; Soft magnetic materials;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.800498

Filename

800498