Particle size-dependent magnetic properties of γ-Fe2O3 nanoparticles

被引：39
|
作者：
Mukadam, MD
Yusuf, SM [1 ]
Sharma, P
Kulshreshtha, SK
机构：
[1] Bhabha Atom Res Ctr, Div Solid State Phys, Bombay 400085, Maharashtra, India
[2] Bhabha Atom Res Ctr, Novel Mat & Struct Chem Div, Bombay 400085, Maharashtra, India
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2004年 / 272卷
关键词：
nanoparticle; superparamagnetism; magnetization measurement; coercivity; maghemite;
D O I：
10.1016/j.jmmm.2003.12.139
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effect of particle size on the magnetic properties of nano-crystalline powders of gamma-Fe2O3 has been studied, using a DC magnetization technique, as a function of temperature and magnetic field. A superparamagnetic-type blocking process is observed in the ZFC and FC magnetization. Coercivity increases with increasing particle size, while the saturation magnetization decreases with increasing particle size. Such anomalous behaviour can be explained in terms of the redistribution of Fe3+ ions, depending on the particle size. (C) 2003 Elsevier B.V. All rights reserved.
引用
收藏
页码：1401 / 1403
页数：3
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