Magnetic behavior of nanocrystalline nickel ferrite synthesized by the reverse micelle technique

被引:293
作者
Kale, A [1 ]
Gubbala, S [1 ]
Misra, RDK [1 ]
机构
[1] Univ Louisiana, Mat Sci & Engn Grp, Dept Chem Engn, Lafayette, LA 70504 USA
关键词
nickel ferrite; spinel; nanoparticles; magnetic measurements;
D O I
10.1016/j.jmmm.2003.11.015
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Nanocrystalline nickel ferrite of crystallite size 5-8 nm, synthesized by the reverse micelle technique were characterized by high-resolution transmission electron microscopy and X-ray diffraction techniques, and the magnetic behavior studied by superconducting quantum interference device. Nanocrystalline nickel ferrite exhibit a blocking temperature of 16 K. They do not attain saturation magnetization even at a high field of 50 kOe. The lack of saturation in high field occurs in association with high field irreversibility and open loop at 50 kOe. The saturation magnetization at 300 K is 25.4 emu/g and at 2 K is 35.5 emu/g, which is significantly lower than that reported for the multidomain bulk nickel ferrite (55 emu/g). This is discussed in terms of a two-component nanoparticle system consisting of a spin glasslike surface layer of a few atomic layers thick and ferrimagnetically aligned core spins. (C) 2003 Elsevier B.V. All rights reserved.
引用
收藏
页码:350 / 358
页数:9
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