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

Authors
Nakatani, Y Hayashi, N Uesaka, Y Fukushima, H Kitakami, O Shimada, Y
Citation
Y. Nakatani et al., Effect of thermal fluctuation on reversal field of magnetic fine particle with surface anisotropy, IEEE MAGNET, 36(5), 2000, pp. 3205-3207
Citations number
8
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
IEEE TRANSACTIONS ON MAGNETICS
ISSN journal
00189464 → ACNP
Volume
36
Issue
5
Year of publication
2000
Part
1
Pages
3205 - 3207
Database
ISI
SICI code
0018-9464(200009)36:5<3205:EOTFOR>2.0.ZU;2-E
Abstract
The magnetization reversal of a nanometer size ferromagnetic particle with surface anisotropy is investigated by micromagnetic computer simulation, Tw o kinds of calculations were performed: calculations with and without therm al fluctuation. In the case without thermal fluctuation a surface anisotrop y of several ergs/cm(2) was found to increase the magnetization reversal fi eld of the particle by a factor of ten as compared with the case without su rface anisotropy, The introduction of surface anisotropy was also found to increase the reversal field, and hence, improve thermal stability.