期刊
LOW TEMPERATURE PHYSICS
卷 39, 期 4, 页码 365-369出版社
AMER INST PHYSICS
DOI: 10.1063/1.4801993
关键词
cobalt compounds; ferrimagnetic materials; magnetic anisotropy; magnetic hysteresis; magnetic particles; magnetic susceptibility; nanomagnetics; pyrolysis
资金
- MES of Ukraine [0112U005918]
- STCU [5205]
Ferrimagnetic nanoparticles of CoFe2O4 about 4-16 nm in diameter were synthesized by pyrolysis of a mixture of Fe and Co acetylacetonates. The field dependences of magnetization and hysteresis loops were investigated in magnetic fields up to 4000 kA/m at various temperatures from 4.2 to 500 K. A considerable contribution, positive or negative depending on the temperature, of surface anisotropy to the effective magnetic anisotropy of the nanoparticles was observed. A correlation was found between the magnetic properties that represent the specificity of small particles, namely, between surface anisotropy, magnetization, and high-field susceptibility. (C) 2013 AIP Publishing LLC
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