SUPERPARAMAGNETISM AND SPIN-GLASS ORDERING IN MAGNETIC NANOCOMPOSITES

被引：181

作者：

MORUP, S

机构：

[1] Physics Department, Technical University of Denmark, Lyngby, DK-2800

来源：

EUROPHYSICS LETTERS | 1994年 / 28卷 / 09期

关键词：

D O I：

10.1209/0295-5075/28/9/010

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Mossbauer spectra of samples containing nano-sized magnetic particles exhibit a transition from a magnetically split spectrum to a doublet or singlet when the temperature is varied, and zero-field-cooled magnetization measurements show a maximum at a certain temperature. When the interactions are weak these features can be explained by superparamagnetic blocking, but in the case of strong interactions they can be explained by ordering of the magnetic moments. A phase diagram, which elucidates these possibilities, is presented.

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页码：671 / 676

页数：6

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