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This article is cited in 15 scientific papers (total in 15 papers)
Low dimensional systems
Mössbauer studies of core-shell FeO/Fe$_{3}$O$_{4}$ nanoparticles
A. S. Kamzina, A. A. Valiullinb, H. Khurshidc, Z. Nematic, H. Srikanthc, M. H. Phanc a Ioffe Institute, St. Petersburg
b Kazan (Volga Region) Federal University
c University of South Florida, Department of Physics
Abstract:
FeO/Fe$_{3}$O$_{4}$ 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 $\sim$20 nm. It was found that the obtained FeO/Fe$_{3}$O$_{4}$ nanoparticles had exchange coupling. The effect of anisotropy on the efficiency of heating (hyperthermic effect) of FeO/Fe$_{3}$O$_{4}$ 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/Fe$_{3}$O$_{4}$ 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 FeO/Fe$_{3}$O$_{4}$, maghemite $\gamma$-Fe$_{2}$O$_{3}$, and wustite FeO.
Received: 26.06.2017
Citation:
A. S. Kamzin, A. A. Valiullin, H. Khurshid, Z. Nemati, H. Srikanth, M. H. Phan, “Mössbauer studies of core-shell FeO/Fe$_{3}$O$_{4}$ nanoparticles”, Fizika Tverdogo Tela, 60:2 (2018), 375–382; Phys. Solid State, 60:2 (2018), 382–389
Linking options:
https://www.mathnet.ru/eng/ftt9315 https://www.mathnet.ru/eng/ftt/v60/i2/p375
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