TEM-study of the precipitation of iron in Nd-Fe-B sintered magnets

Author

Fidler, Josef ; Tawara, Yoshio

Author_Institution

Inst. of Appl. Phys., Tech. Univ. of Vienna, Austria

Volume

24

Issue

2

fYear

1988

fDate

3/1/1988 12:00:00 AM

Firstpage

1951

Lastpage

1953

Abstract

The microstructure of sintered Nd-Fe-B magnets is studied by analytical electron microscopy. The presence of Fe-rich precipitates was first found in magnets showing a small kink in the demagnetization curve, which is an evidence for soft magnetic nucleation centers for reversed magnetic domains within the magnet. alpha -iron precipitates occurred outside as well as within the hard magnetic 2:14:1 grains and were also found in other commercial-grade magnets with a nominal composition close to Nd15-Fe77-B8.

Keywords

boron alloys; demagnetisation; ferromagnetic properties of substances; iron alloys; magnetic domains; neodymium alloys; permanent magnets; precipitation; transmission electron microscope examination of materials; Fe-rich precipitates; Nd-Fe-B; Nd-Fe-B sintered magnets; TEM-study; alpha Fe; analytical electron microscopy; demagnetization curve; hard magnetic 2:14:1 grains; kink; microstructure; precipitation; reversed magnetic domains; soft magnetic nucleation centers; Iron; Magnetic analysis; Magnetic anisotropy; Magnetic domains; Magnetic force microscopy; Magnets; Microstructure; Perpendicular magnetic anisotropy; Soft magnetic materials; Transmission electron microscopy;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.11656

Filename

11656