Mössbauer Studies of Core-Shell FeO/Fe3O4 Nanoparticles

被引：0
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作者：
A. S. Kamzin
A. A. Valiullin
H. Khurshid
Z. Nemati
H. Srikanth
M. H. Phan
机构：
[1] Ioffe Institute,Department of Physics
[2] Kazan Federal University,undefined
[3] University of South Florida,undefined
来源：
Physics of the Solid State | 2018年 / 60卷
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摘要：
FeO/Fe3O4 nanoparticles were synthesized by thermal decomposition. Electron microscopy revealed that these nanoparticles were of the core-shell type and had a spherical shape with an average size of ~20 nm. It was found that the obtained FeO/Fe3O4 nanoparticles had exchange coupling. The effect of anisotropy on the efficiency of heating (hyperthermic effect) of FeO/Fe3O4 nanoparticles by an external alternating magnetic field was examined. The specific absorption rate (SAR) of the studied nanoparticles was 135 W/g in the experiment with an external alternating magnetic field with a strength of 600 Oe and a frequency of 310 kHz. These data led to an important insight: the saturation magnetization is not the only factor governing the SAR, and the efficiency of heating of magnetic FeO/Fe3O4 nanoparticles may be increased by enhancing the effective anisotropy. Mössbauer spectroscopy of the phase composition of the synthesized nanoparticles clearly revealed the simultaneous presence of three phases: magnetite Fe3O4, maghemite γ-Fe2O3, and wustite FeO.
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页码：382 / 389
页数：7
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