A collective dynamics description of dipolar interactions and the coercive field of magnetic nanoparticles

被引：8

作者：

Das, R. K. ^{[1
]}

Rawal, S. ^{[2
]}

Norton, D. ^{[2
]}

Hebard, A. F. ^{[1
]}

机构：

[1] Univ Florida, Dept Phys, Gainesville, FL 32611 USA

[2] Univ Florida, Dept Mat Sci & Engn, Gainesville, FL 32611 USA

来源：

JOURNAL OF APPLIED PHYSICS | 2010年 / 108卷 / 12期

基金：

美国国家科学基金会;

关键词：

PARTICLE-SIZE; FORCE; DEPENDENCE; MEDIA;

D O I：

10.1063/1.3524277

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The effect of dipolar interactions on the coercive field of Ni nanoparticles embedded as layers in a Al(2)O(3) host matrix is discussed. The results for two sets of 5 layer samples with different interlayer spacings and a set of single layer samples are compared for samples with particle size varying from 3 nm (single domain) to 60 nm (multiple domain). The dipolar interactions are strongest in the samples with shorter interlayer distances and weakest for the single layer samples. Our observation that dipolar interactions increase the coercive field and decrease the critical diameter separating single domain from multiple domain behavior reinforces a description based on collective dynamics. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3524277]

引用

页数：4

共 29 条

[1]

Aharoni A., 1996, Introduction to the Theory of Ferromagnetism

[2] THERMAL FLUCTUATIONS OF A SINGLE-DOMAIN PARTICLE [J].