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

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

doi:10.1109/20.908739

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

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

Division of Inorganic Material Research

Research output: Contribution to journal › Conference article › peer-review

3 Citations (Scopus)

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.

Original language	English
Pages (from-to)	3205-3207
Number of pages	3
Journal	IEEE Transactions on Magnetics
Volume	36
Issue number	5 I
DOIs	https://doi.org/10.1109/20.908739
Publication status	Published - 2000 Sep
Event	2000 International Magnetics Conference (INTERMAG 2000) - Toronto, Ont, Canada Duration: 2000 Apr 9 → 2000 Apr 12

Keywords

Computer simulation
Fine particle
Micromagnetics
Surface anisotropy

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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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 = "Computer simulation, Fine particle, Micromagnetics, Surface anisotropy",

author = "Y. Nakatani and N. Hayashi and Y. Uesaka and H. Fukushima and O. Kitakami and Y. Shimada",

note = "Funding Information: Manuscript received February 4, 2000. This work was supported by RFTF of Japan Society for the Promotion of Science under Grant 97R14701 and SRC Japan. Y. Nakatani and N. Hayashi are with University of Electro-Communications, Chofu, Tokyo 182-8585, Japan (e-mail: nakatani@cs.uec.ac.jp). Y. Uesaka is with Nihon University, Kohriyama, Fukushima 963, Japan. H. Fukushima is in Honda-Cho, Chiba 266, Japan. O. Kitakami and Y. Shimada are with Tohoku University, Katahira 2-1-1, Sendai 980-8577, Japan. Publisher Item Identifier S 0018-9464(00)07926-7.; 2000 International Magnetics Conference (INTERMAG 2000) ; Conference date: 09-04-2000 Through 12-04-2000",

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T1 - Effect of thermal fluctuation on reversal field of magnetic fine particle with surface anisotropy

AU - Nakatani, Y.

AU - Hayashi, N.

AU - Uesaka, Y.

AU - Fukushima, H.

AU - Kitakami, O.

AU - Shimada, Y.

N1 - Funding Information: Manuscript received February 4, 2000. This work was supported by RFTF of Japan Society for the Promotion of Science under Grant 97R14701 and SRC Japan. Y. Nakatani and N. Hayashi are with University of Electro-Communications, Chofu, Tokyo 182-8585, Japan (e-mail: nakatani@cs.uec.ac.jp). Y. Uesaka is with Nihon University, Kohriyama, Fukushima 963, Japan. H. Fukushima is in Honda-Cho, Chiba 266, Japan. O. Kitakami and Y. Shimada are with Tohoku University, Katahira 2-1-1, Sendai 980-8577, Japan. Publisher Item Identifier S 0018-9464(00)07926-7.

PY - 2000/9

Y1 - 2000/9

N2 - 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.

AB - 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.

KW - Computer simulation

KW - Fine particle

KW - Micromagnetics

KW - Surface anisotropy

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EP - 3207

JO - IEEE Transactions on Magnetics

JF - IEEE Transactions on Magnetics

SN - 0018-9464

IS - 5 I

T2 - 2000 International Magnetics Conference (INTERMAG 2000)

Y2 - 9 April 2000 through 12 April 2000

ER -

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

Abstract

Keywords

ASJC Scopus subject areas

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