Irreversible magnetization in nickel nanoparticles

被引：72

作者：

Zhang, P

Zuo, F ^{[1
]}

Urban, FK

Khabari, A

Griffiths, P

Hosseini-Tehrani, A

机构：

[1] Univ Miami, Dept Phys, Coral Gables, FL 33124 USA

[2] Florida Int Univ, Dept Elect Engn, Miami, FL 33199 USA

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2001年 / 225卷 / 03期

基金：

美国国家科学基金会;

关键词：

nanoparticles; magnetization; irreversible temperature; dipolar interaction; magnetic relaxation;

D O I：

10.1016/S0304-8853(00)01379-2

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report magnetic studies on nickel nanoparticle films of average particle size of 10 nm. Magnetization as a function of field and temperature show that the system behaves like a random magnet with a strongly field-dependent irreversible temperature, below which the magnetization relax logarithmically with time. The effective barrier extrapolated increases strongly with temperature for a given field. The time dependence suggests the dominant dipole-dipole interaction in this magnetic nanoparticle system. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：337 / 345

页数：9

共 21 条

[1] Anomalous properties of magnetic nanoparticles [J].