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Specific absorption rate in Zn-doted ferrites for self-controlled magnetic hyperthermia

Author

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  • Angl Apostolov

    (University of Architecture, Civil Engineering and Geodesy, Faculty of Hydrotechnics, Department of Physics)

  • Iliana Apostolova

    (University of Forestry, Faculty of Forest Industry)

  • Julia Wesselinowa

    (University of Sofia, Department of Physics, J. Bouchier Blvd. 5)

Abstract

In this paper, we study mixed ferrites nanoparticles with structure formula Me1−xZnxFe2O4 (Me = Co, Ni, Cu, Mn) appropriated for self-controlled magnetic hyperthermia (SMHT) for in vivo and in vitro applications. We discuss in details the influence of the size d, the Zn-ion concentration x on the magnetic characteristics: saturation magnetization MS, coercivity HC, effective anisotropy Keff and specific absorption rate (SAR). From a theoretical point of view we investigate monodispersed, non-interactive, single-domain spherical magnetic nanoparticles (MNPs). We propose a simple core–shell model with a constant thickness of the surface layer. We explain the behaviour of SAR as a function of size and dopping based on two thermal heating mechanisms: the mechanism leading to dynamic hysteresis loops of superparamagnetic origin and the heating mechanism via conventional metastable hysteresis. We investigate also a thermal heating efficiency based on the Zn-ion concentration. We show that whether SAR decreases (increases) when doping increases depends on whether the nanoparticle diameter d is smaller (larger) than the particle size dmax for which SAR has a maximum value. The numerical results are in qualitative agreement with many experimental data. Graphical abstract

Suggested Citation

  • Angl Apostolov & Iliana Apostolova & Julia Wesselinowa, 2019. "Specific absorption rate in Zn-doted ferrites for self-controlled magnetic hyperthermia," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 92(3), pages 1-16, March.
    • Handle: RePEc:spr:eurphb:v:92:y:2019:i:3:d:10.1140_epjb_e2019-90567-2
    DOI: 10.1140/epjb/e2019-90567-2
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    Keywords

    Solid State and Materials;

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