Magnetic, electric, and dielectric properties of ion-doped Fe $$_2$$ 2 TeO $$_6$$ 6 nanoparticles

I. N. Apostolova, A. T. Apostolov and J. M. Wesselinowa ()
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I. N. Apostolova: University of Forestry
A. T. Apostolov: Civil Engineering and Geodesy
J. M. Wesselinowa: Sofia University “St. Kliment Ohridski”

The European Physical Journal B: Condensed Matter and Complex Systems, 2023, vol. 96, issue 12, 1-5

Abstract: Abstract The magnetic, electric, and dielectric properties of pure and ion-doped antiferromagnetic magnetoelectric Fe $$_2$$ 2 TeO $$_6$$ 6 (FTO) nanoparticles (NPs) are investigated using a microscopic model and the Green’s function theory. The Neel temperature $$T_N$$ T N decreases with decreasing NP size. Due to uncompensated spins on the surface, there appears a small ferromagnetism. By different ion doping is observed also a small ferromagnetism. The magnetic properties of FTO can be changed by different ion doping at the Te or Fe places in FTO NPs. $$T_N$$ T N is enhanced by Nb or Zr doping at the Te site, whereas by Cr doping at the Fe site, it is reduced. The polarization P of a pure FTO NP is enhanced by applying an external magnetic field. P increases with increasing magnetic field which is evidence for the multiferroism of FTO. The temperature dependence of the dielectric constant $$\epsilon $$ ϵ for a pure FTO NP shows at $$T_N$$ T N = 180 K a small peak which disappears for high-frequency values. The real part of $$\epsilon $$ ϵ increases, whereas the imaginary part decreases with increasing Zr dopants in FTO at the Te site. Graphical abstract

Date: 2023
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DOI: 10.1140/epjb/s10051-023-00639-3

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