Mössbauer Studies of Core-Shell FeO/Fe₃O₄ Nanoparticles

Authors

A. S. Kamzin, Ioffe Institute
A. A. Valiullin, Kazan Federal University
Zohreh Nemati Porshokouh, University of South FloridaFollow
Sowmya Srikanth, University of South FloridaFollow
Manh-Huong Phan, University of South FloridaFollow

Document Type

Article

Publication Date

3-2018

Digital Object Identifier (DOI)

https://doi.org/10.1134/S1063783418020129

Abstract

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.

Was this content written or created while at USF?

Yes

Citation / Publisher Attribution

Physics of the Solid State, v. 60, p. 382-389

Scholar Commons Citation

Kamzin, A. S.; Valiullin, A. A.; Nemati Porshokouh, Zohreh; Srikanth, Sowmya; and Phan, Manh-Huong, "Mössbauer Studies of Core-Shell FeO/Fe₃O₄ Nanoparticles" (2018). Physics Faculty Publications. 65.
https://digitalcommons.usf.edu/phy_facpub/65