From pure superparamagnetism to glass collective state in γ-Fe2O3 nanoparticle assemblies

被引：105

作者：

Dormann, JL

Fiorani, D

Cherkaoui, R

Tronc, E

Lucari, F

D'Orazio, F

Spinu, L

Noguès, M

Kachkachi, H

Jolivet, JP

机构：

[1] Univ Paris 06, F-75252 Paris 05, France

[2] UVSQ, CNRS, LMOV, F-78035 Versailles, France

[3] CNR, MAT, IC, I-00016 Rome, Italy

[4] Univ Aquila, Dipartimento Fis, INFM, I-67100 Laquila, Italy

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 1999年 / 203卷

关键词：

fine particles; superparamagnetism; dipolar interactions; magnetic ordering;

D O I：

10.1016/S0304-8853(99)00180-8

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

AC susceptibility (5-10(4) Hz) and Mossbauer spectroscopy studies of gamma-Fe2O3 4.7 nm particle assemblies with interparticle interactions of varying strength reveal three magnetic regimes: pure superparamagnetic, superparamagnetic modified by interactions, and collective. The properties of the last one, called glass collective state, are close to those of spin glasses showing a phase transition. (C) 1999 Elsevier Science B.V. All rights reserved.

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页码：23 / 27

页数：5

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