19.06.2023
Theoretical and experimental research on nonlinear current-induced magnetoelectric effects in single-crystal and polycrystalline ferrites
Starting from 2016 we have experimentally observed and theoretically investigated the room temperature current–induced nonlinear magnetoelectric effect in the ferrites. The effect takes place in single crystal ferrites and manifests itself as a significant decrease in the saturation magnetization and an increase in the uniaxial magnetocrystalline anisotropy with the non-polarized DC electric current flowing across the bulk of moderately conductive ferrite specimen. The effect was registered using microwave spectroscopy measurement techniques through the shift in magnetic modes’ frequencies with electric current. It was found that magnetic resonances’ frequency shift as well as the modification of material’s magnetic parameters are linearly proportional to the applied DC electric power, and thus is bilinear with respect to applied electric current or electric field. The effect was registered in various M-type hexaferrites with the general composition BaAlxFe12−xO19, SrAlxFe12−xO19 as well as in Y-type hexaferrite with the chemical formula Ba2Zn2Fe12O22 and the qualitatively similar results were obtained in all cases.
A phenomenological description of the observed magnetobielectric effects, consistent with intrinsic crystallomagnetic symmetry of hexaferrite, has been proposed and the expressions for corresponding magnetoelectric coefficients have been derived.
A further investigation of the above-mentioned effect in polycrystalline ferrite materials is planned since those materials are much cheaper and easier in preparation than the single-crystal specimens.
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Contacts:
Maksym Popov, D. Sc. in Physics and Mathematics, maxim_popov@knu.ua
Hryhorii Chumak, Ph. D, chumakhl@knu.ua
Selected publications:
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Physical Review B, 94, 224419 (2016).
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Journal of Applied Physics, 128, 113905 (2020).
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Scientific Reports, 11, 8733 (2021).