DUAL-SPIN DYNAMICS OF SMALL FE PARTICLES

被引：45

作者：

HENNION, M ^{[1
]}

BELLOUARD, C ^{[1
]}

MIREBEAU, I ^{[1
]}

DORMANN, JL ^{[1
]}

NOGUES, M ^{[1
]}

机构：

[1] CNRS, MAGNET LAB, F-92195 MEUDON, FRANCE

来源：

EUROPHYSICS LETTERS | 1994年 / 25卷 / 01期

关键词：

D O I：

10.1209/0295-5075/25/1/008

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Inelastic neutron scattering has been used to study the dynamics of a dispersion of fine Fe particles (diameter approximately 20 angstrom) on the time scale of 10(-10)-10(-11) s. It gives the first experimental evidence of a dual dynamics in zero field corresponding to a relaxation time (longitudinal) and to a fluctuation one (semi-transverse) at low temperature, merging in an isotropic regime at high temperature. In this isotropic regime, the fluctuation time appears limited to a temperature-independent value which could be related to the anisotropy energy of the particle.

引用

页码：43 / 48

页数：6

共 15 条

[1] RELAXATION-TIME OF SUPERPARAMAGNETIC PARTICLES WITH CUBIC ANISOTROPY
AHARONI, A
[J]. PHYSICAL REVIEW B, 1973, 7 (03): : 1103 - 1107
[2] RELAXATION-TIME OF FINE MAGNETIC PARTICLES IN UNIAXIAL SYMMETRY
BESSAIS, L
BENJAFFEL, L
DORMANN, JL
[J]. PHYSICAL REVIEW B, 1992, 45 (14): : 7805 - 7815
[3] THERMAL FLUCTUATIONS OF A SINGLE-DOMAIN PARTICLE
BROWN, WF
[J]. PHYSICAL REVIEW, 1963, 130 (05): : 1677 - +
[4] DYNAMIC AND STATIC PROPERTIES OF INTERACTING FINE FERROMAGNETIC PARTICLES
CHANTRELL, RW
WOHLFARTH, EP
[J]. JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1983, 40 (1-2) : 1 - 11
[5] A DYNAMIC STUDY OF SMALL INTERACTING PARTICLES - SUPERPARAMAGNETIC MODEL AND SPIN-GLASS LAWS
DORMANN, JL
BESSAIS, L
FIORANI, D
[J]. JOURNAL OF PHYSICS C-SOLID STATE PHYSICS, 1988, 21 (10): : 2015 - 2034
[6] FANIN PC, 1991, J PHYS D, V24, P77
[7] HENNION M, 1993, 1993 ANN C MAGN MAGN
[8] HENNION M, 1992, STUDIES MAGNETIC PRO
[9] MANY-STATE RELAXATION MODEL FOR THE MOSSBAUER-SPECTRA OF SUPERPARAMAGNETS
JONES, DH
SRIVASTAVA, KKP
[J]. PHYSICAL REVIEW B, 1986, 34 (11): : 7542 - 7548
[10] A RE-EXAMINATION OF MODELS OF SUPERPARAMAGNETIC RELAXATION
JONES, DH
SRIVASTAVA, KKP
[J]. JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1989, 78 (03) : 320 - 328

← 1 2 →