Effects of magnetic interparticle coupling on the blocking temperature of ferromagnetic nanoparticle arrays

被引：58

作者：

Knobel, M. ^{[1
]}

Nunes, W. C.

Winnischofer, H.

Rocha, T. C. R.

Socolovsky, L. M.

Mayorga, C. L.

Zanchet, D.

机构：

[1] Univ Estadual Campinas, Inst Fis Gleb Wataghin, Lab Mat & Baixas Temp, BR-13083970 Campinas, SP, Brazil

[2] Lab Nacl Luz Sincrotron, BR-13084971 Campinas, SP, Brazil

[3] Univ Fed Goias, Inst Fis, BR-74001970 Goiania, GO, Brazil

来源：

JOURNAL OF NON-CRYSTALLINE SOLIDS | 2007年 / 353卷 / 8-10期

基金：

巴西圣保罗研究基金会;

关键词：

nanocrystals; magnetic properties; nanoparticles;

D O I：

10.1016/j.jnoncrysol.2006.12.037

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

In this work we report on the study of the magnetic properties of 2D arrays and 3D dispersions of colloidal iron oxide nanoparticles prepared by Langmuir-Blodgett technique and by dilution in paraffin wax solid solution, respectively. The influence of magnetic interparticle coupling on the superparamagnetic relaxation behavior was investigated by means of DC magnetization measurements. A quantitative analysis of the field dependence of the blocking temperature and the role of the interparticle coupling is presented. We explain our results using a phenomenological model based on the random anisotropy and micromagnetic theories that account for particle coupling effects in the superparamagnetic properties. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：743 / 747

页数：5

共 23 条

[1] RANDOM ANISOTROPY IN AMORPHOUS FERROMAGNETS [J].