Ion dependence of magnetic anisotropy in MFe2O4 (M = Fe, Co, Mn) nanoparticles synthesized by high-temperature reaction

被引：23
|
作者：
Arelaro, A. D. [1 ]
Lima, E., Jr. [1 ]
Rossi, L. M. [2 ]
Kiyohara, P. K. [1 ]
Rechenberg, H. R. [1 ]
机构：
[1] Univ Sao Paulo, LMM, Inst Fis, BR-05315970 Sao Paulo, Brazil
[2] Univ Sao Paulo, Intituto Quim, BR-05508000 Sao Paulo, Brazil
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2008年 / 320卷 / 14期
基金：
巴西圣保罗研究基金会;
关键词：
fine particle; ferrite; chemical synthesis; magnetic anisotropy;
D O I：
10.1016/j.jmmm.2008.02.066
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The influence of different M2+ cations on the effective magnetic anisotropy of systems composed of MFe2O4 (M Fe, Co and Mn) nanoparticles was investigated. Samples were prepared by the high-temperature (538 K) solution phase reaction of Fe (acac) 3, Co (acac) 2 and Mn (acac) 2 with 1,2 octanodiol in the presence of oleic acid and oleylamine. The final particles are coated by an organic layer of oleic acid that prevents agglomeration. Transmission electron microscopy (TEM) images show that particles present near spherical form and a narrow grain size distribution, with mean diameters in the range of 4.5 - 7.6 nm. Powder samples were analyzed by ac susceptibility and Mossbauer measurements, and K-eff for all samples was evaluated using both techniques, showing a strong dependence on the nature of the divalent cation. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码：E335 / E338
页数：4
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