Effect of interparticle interactions on the dynamical properties of γ-Fe2O3 nanoparticles

被引：102

作者：

Dormann, JL ^{[1
]}

Spinu, L

Tronc, E

Jolivet, JP

Lucari, F

D'Orazio, F

机构：

[1] Univ Versailles, CNRS, LMOV, F-78035 Versailles, France

[2] Univ Paris 07, CNRS, LCMC, URA 1466, F-75252 Paris 05, France

[3] Univ Aquila, INFM, I-67110 Coppito, Italy

[4] Univ Aquila, Dipartimento Fis, I-67110 Coppito, Italy

[5] CNR, IC MAT, I-00016 Monterotondo Stn, Italy

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 1998年 / 183卷 / 03期

关键词：

nanoparticles; interparticle interactions; dynamical magnetic properties;

D O I：

10.1016/S0304-8853(97)01123-2

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The dynamical properties of gamma-Fe2O3 nanoparticles dispersed in a polymer have been investigated bq means of AC susceptibility measurements in a large frequency range (10 < nu < 10(4) Hz) and Mossbauer spectroscopy measurements. The frequency dependence of the blocking temperature, T-B, has been analysed for a series of samples with the same volume distribution and interparticle interactions of different strengths. An increase of the effective energy barrier with increasing interaction strength has been observed unambiguously, in agreement with our model, based on a statistical calculation of the interaction energy for a disordered assembly of particles with volume distribution and easy axes in random directions. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：L255 / L260

页数：6

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