STABILITY OF CERTAIN MAGNETIC-MODES IN FINE FERROMAGNETIC PARTICLES

被引：20

作者：

KONDORSKY, EI

机构：

[1] Physics Faculty, Moscow State University, Moscow, U.S.S.R

来源：

IEEE TRANSACTIONS ON MAGNETICS | 1979年 / 15卷 / 05期

关键词：

D O I：

10.1109/TMAG.1979.1060340

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Conditions of stability of the magnetization curling mode in fine spherical and cylindrical particles and of the magnetization helicoid structure in fine cylindrical particles are derived, and magnetization reversal processes in such particles are considered. The application of Ritz's method for solving the variational problem of finding the local magnetization vectors in the volume of a particle provides a convenient way of finding the conditions mentioned above. It has been shown that the magnetization curling mode in a spherical fine particle with radius larger than a critical one is stable in a well-determined interval of the external magnetic field, provided the magnetocrystalline anisotropy constant is less than a certain value Ko. In such a case the hysteresis loop of a spherical particle measured in an easy direction is no longer rectangular. The magnetization curling and helicoid modes are both unstable in fine cylindrical particles with positive or zero values of the magnetocrystalline anisotropy constant. The hysteresis loop of such particles magnetized along the axis of rotation is rectangular. Copyright © 1979 by The lnstitutc of Electrical and Electronics Engineers, Inc.

引用

页码：1209 / 1214

页数：6

共 18 条

[1] MAGNETIZATION CURVE OF THE INFINITE CYLINDER [J].

AHARONI, A ;

SHTRIKMAN, S .

PHYSICAL REVIEW, 1958, 109 (05) :1522-1528

[2]

BROWN WF, 1962, J PHYS SOC JPN, V17, P540

[3] CRITERION FOR UNIFORM MICROMAGNETIZATION [J].

BROWN, WF .

PHYSICAL REVIEW, 1957, 105 (05) :1479-1482

[4]

BROWN WF, 1969, ANN NY ACAD SCI, V147, P461

[5] MAGNETIZATION CURLING IN A SPHERE [J].

EISENSTEIN, I ;

AHARONI, A .

JOURNAL OF APPLIED PHYSICS, 1976, 47 (01) :321-328

[6] CRITICAL SIZE AND NUCLEATION FIELD OF IDEAL FERROMAGNETIC PARTICLES [J].

FREI, EH ;

SHTRIKMAN, S ;

TREVES, D .

PHYSICAL REVIEW, 1957, 106 (03) :446-454

[7]

FRENKEL YI, 1930, NATURE, V126, P274

[8] APPROACH TO ELONGATED FINE-PARTICLE MAGNETS [J].

JACOBS, IS ;

BEAN, CP .

PHYSICAL REVIEW, 1955, 100 (04) :1060-1067

[9] THEORY OF THE STRUCTURE OF FERROMAGNETIC DOMAINS IN FILMS AND SMALL PARTICLES [J].

KITTEL, C .

PHYSICAL REVIEW, 1946, 70 (11-1) :965-971

[10]

KONDORSKII E, 1950, DOKL AKAD NAUK SSSR+, V74, P213

← 1 2 →