LINEAR AND NONLINEAR SUSCEPTIBILITIES OF FERROMAGNETIC FINE PARTICLES IN CU97CO3 ALLOY

被引：29

作者：

BITOH, T ^{[1
]}

OHBA, K ^{[1
]}

TAKAMATSU, M ^{[1
]}

SHIRANE, T ^{[1
]}

CHIKAZAWA, S ^{[1
]}

机构：

[1] MURORAN INST TECHNOL, DEPT MAT SCI & ENGN, MURORAN, HOKKAIDO 050, JAPAN

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1995年 / 64卷 / 04期

关键词：

COBALT FINE PARTICLES; AC SUSCEPTIBILITY; BLOCKING OF SUPERPARAMAGNETIC PARTICLES; SPIN GLASS;

D O I：

10.1143/JPSJ.64.1311

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The ac linear (chi(0)) and nonlinear (chi(2)) susceptibilities of ferromagnetic fine cobalt particles, which were precipitated in a Cu97Co3 alloy, have been studied. The chi(0) has a spin-glass-like maximum and chi(2) has a very broad negative peak at a low temperature. At high temperatures, the in-phase linear susceptibility chi(0)' obeys the Curie law and the in-phase nonlinear susceptibility chi(2)' is proportional to T (-3). A quantitative analysis of chi(0) and chi(2) based on a simplified superparamagnetic blocking model has been performed, The temperature dependence of the in-phase and out-of-phase susceptibilities is well described quantitatively by the superparamagnetic blocking model. It is concluded the behavior of chi(2) can be explained by the summation of the nonlinear term of the Langevin function over particle volume distribution. The analysis also yields information about the particle volume distribution and a value of anisotropy energy.

引用

页码：1311 / 1319

页数：9

共 30 条

[1] RELAXATION-TIME OF SUPERPARAMAGNETIC PARTICLES WITH CUBIC ANISOTROPY [J].