Piezoelectric tuning of the resonance frequency in the synthetic multiferroic structures a-Fe2O3 /68%Pb(Mg1=3 Nb2=3)O3-32%PbTiO3 in the sub-THz range

Applied Physics Letters. 2025. Vol. 127. No. 14. Article 142409.

Bogdanova T. V., Meshcheryakov A. A., D. V. Kalyabin, Sadovnikov A. V., A. R. Safin, Nikitov S.

In this article, we present the results of studies carried out on the synthetic multiferroic structure Fe2O3/PMN-PT. The thicknesses of the Fe2O3  single crystal and PMN-PT piezoelectric substrate were 500  m. Using Brillouin light scattering spectroscopy, we experimentally studied the excitation of quasi-ferro- and antiferromagnetic modes of Fe2O3⁠, as well as the effect of induced deformations from the polarized piezoelectric layer on the frequencies of quasi-ferro- and antiferromagnetic modes. For the PMN-PT [001] and [011] cuts, we considered the dependencies of the frequency of the quasi-ferromagnetic mode on the in-plane rotation of the magnetic field at the applied electric field with a voltage of 0–1000 V and on the magnetic field at fi=0 and fi=45⁠. We built a model that describes the linear piezoelectric and the nonlinear electrostrictive contributions, which was applied to the “butterfly-shaped” strain–voltage characteristic of the PMN-PT and the following hysteresis shift of antiferromagnetic resonance frequency with an applied electric field of 0–1000 V. We proved that by applying voltage to the PMN-PT substrate, it was possible to achieve a significant tuning of the antiferromagnetic resonance mode frequency (up to 10%). Our results show that such a synthetic multiferroic structure is a suitable component for magnonic devices with frequency tuning in the GHz and sub-THz frequency ranges.

Keywords: антиферромагнетики и слабый ферромагнетизм, сегнетоэлектрики и пьезоэлектрики, antiferromagnetic resonance, антиферромагнитный резонанс, Ferroelectrics, antiferromagnet and weak ferromagnetism