Effect of thermal fluctuation on reversal field of magnetic fine particle with surface anisotropy

Author

Nakatani, Y. ; Hayashi, N. ; Uesaka, Y. ; Fukushima, H. ; Kitakami, O. ; Shimada, Y.

Author_Institution

Univ. of Electro-Commun., Tokyo, Japan

Volume

36

Issue

5

fYear

2000

fDate

9/1/2000 12:00:00 AM

Firstpage

3205

Lastpage

3207

Abstract

The magnetization reversal of a nanometer size ferromagnetic particle with surface anisotropy is investigated by micromagnetic computer simulation. Two kinds of calculations were performed: calculations with and without thermal fluctuation. In the case without thermal fluctuation a surface anisotropy of several ergs/cm² was found to increase the magnetization reversal field of the particle by a factor of ten as compared with the case without surface anisotropy. The introduction of surface anisotropy was also found to increase the reversal field, and hence, improve thermal stability

Keywords

magnetic anisotropy; magnetic particles; magnetic recording noise; magnetisation reversal; magnetic fine particle; magnetisation reversal field; micromagnetic computer simulation; nanometer size ferromagnetic particle; surface anisotropy; thermal fluctuation; Anisotropic magnetoresistance; Computer simulation; Fluctuations; Magnetic anisotropy; Magnetic particles; Magnetic recording; Magnetization reversal; Micromagnetics; Perpendicular magnetic anisotropy; Saturation magnetization;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.908739

Filename

908739