Micromagnetic grain as a nonlinear oscillator

被引：22

作者：

Safonov, VL ^{[1
]}

机构：

[1] Toyota Technol Inst, Informat Storage Mat Lab, Tempaku Ku, Nagoya, Aichi 4688511, Japan

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 1999年 / 195卷 / 02期

关键词：

magnetic grain; nonlinear oscillator; thermal fluctuations; reversal;

D O I：

10.1016/S0304-8853(99)00143-2

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A new theoretical approach is considered to analyse the behaviour of micromagnetic grains. The coherent rotation of magnetizations is represented as dynamics of a nonlinear oscillator. The Langevin equations are introduced to study the role of thermal fluctuations and the corresponding Fokker-Planck equation is obtained. It is shown that the conventional Landau-Lifshitz-Gilbert damping is consistent with thermodynamics only for small deviations of magnetization from the equilibrium state. The mean first passage time from the initial potential well is calculated. (C) 1999 Published by Elsevier Science B.V. All rights reserved.

引用

页码：523 / 529

页数：7

共 24 条

[1]

Bertram H., 1994, Theory of Magnetic Recording

[2] FUNDAMENTAL MAGNETIZATION PROCESSES IN THIN-FILM RECORDING MEDIA [J].

BERTRAM, HN ;

ZHU, JG .

SOLID STATE PHYSICS: ADVANCES IN RESEARCH AND APPLICATIONS, VOL 46, 1992, 46 :271-371

[3] THERMAL FLUCTUATIONS OF A SINGLE-DOMAIN PARTICLE [J].

BROWN, WF .

PHYSICAL REVIEW, 1963, 130 (05) :1677-+

[4]

CHANTRELL RW, 1992, HIGH DENSITY DIGITAL, P101

[5]

Coffey W., 1996, LANGEVIN EQUATION

[6]

Coffey W.T, 1993, Adv. Chem. Phys., P263, DOI [10.1002/9780470141410.ch5/summary, DOI 10.1002/9780470141410.CH5]

[7] Thermal-induced inversion of the magnetic moment in superparamagnetic particles [J].

Denisov, SI ;

Yunda, AN .

PHYSICA B, 1998, 245 (03) :282-287

[8]

DENISOV SI, 1997, INT 97 APR NEW ORL

[9]

Dirac P.A.M., 1958, The Principles of Quantum Mechanics

[10]

Dormann JL, 1997, ADV CHEM PHYS, V98, P283, DOI 10.1002/9780470141571.ch4

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