Temperature dependence of magnetic anisotropy constant in CoFe2O4 nanoparticles examined by Mössbauer spectroscopy

被引：0
|
作者：
Sunghyun Yoon
机构：
[1] Gunsan National University,Department of Physics
来源：
Hyperfine Interactions | 2015年 / 231卷
关键词：
Magnetic anisotropy constant; Magnetic nanoparticles; Mössbauer spectroscopy; Particle size distribution;
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学科分类号：
摘要：
The temperature dependence of the effective magnetic anisotropy constant of CoFe2O4 nanoparticles is determined based on the measurements of SQUID magnetometry and Mössbauer spectroscopy. Under an intuitive assumption that the superparamagnetic fraction of the cumulative area in the particle size distribution at a temperature is equal to the doublet fraction in the Mössbauer spectra at that temperature, we are able to get a relation between r and TB, from which the temperature dependence of the effective magnetic anisotropy constant is determined. The resultant magnetic anisotropy constant increases markedly with decreasing temperature from 2.0 ×105 J/m 3 at 300 K to 8.3 ×106 J/m 3 at 125 K.
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页码：21 / 28
页数：7
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