Analysis of Magnetization Reversal Process of Nd–Fe–B Sintered Magnets by Magnetic Domain Observation Using Kerr Microscope

Author

Takezawa, Masaaki ; Kimura, Yuichi ; Morimoto, Yuuki ; Yamasaki, Jiro

Author_Institution

Dept. of Appl. Sci. for Integrated Syst. Eng., Kyusyu Inst. of Technol., Kitakyushu, Japan

Volume

49

Issue

7

fYear

2013

fDate

Jul-13

Firstpage

3262

Lastpage

3264

Abstract

We used a Kerr microscope, image processing, and photo editing to clarify magnetization reversal and its propagation in a sintered Nd-Fe-B magnet. Magnetic domain change was observed when a dc field from +20 to 20 kOe was applied to a sintered Nd-Fe-B magnet. Simultaneous magnetization reversal in several grains along the easy axis direction and its propagation to neighboring grains occurred. This indicates that the nucleation field in a grain and magnetic interaction between grains are important controlling factors of the coercivity of sintered Nd-Fe-B magnets.

Keywords

Kerr magneto-optical effect; boron alloys; coercive force; grain size; image processing; iron alloys; magnetic domains; magnetisation reversal; neodymium alloys; nucleation; sintering; Kerr microscopy; NdFeB; coercivity; grain size; image processing; magnetic domain; magnetic interaction; magnetization reversal; nucleation field; photoediting; sintered magnets; Magnetic domain walls; Magnetic domains; Magnetic force microscopy; Magnetic resonance imaging; Magnetization reversal; Magnetostatics; Microscopy; Domain structure; Kerr microscope; image processing; sintered Nd–Fe–B magnet;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2013.2241748

Filename

6559240