Magnetoelectric coupling in a ferroelectric/ferromagnetic chain revealed by ferromagnetic resonance

TL;DR

This paper demonstrates that ferromagnetic resonance (FMR) can be used to measure the magnetoelectric coupling coefficient in a multiferroic chain, providing a new theoretical and numerical approach for understanding multiferroic interactions.

Contribution

It introduces a theoretical and numerical method to access the magnetoelectric coupling coefficient via FMR in a ferroelectric/ferromagnetic chain, including effects of depolarizing field.

Findings

FMR spectra are sensitive to interface electric polarization orientation.

FMR spectra depend on applied static electric field.

Proposed method enables measurement of magnetoelectric coupling coefficient.

Abstract

Understanding the multiferroic coupling is one of the key issues in the feld of multiferroics. As shown here theoretically, the ferromagnetic resonance (FMR) renders possible an access to the magnetoelectric coupling coefficient in composite multiferroics. This we evidence by a detailed analysis and numerical calculations of FMR in an unstrained chain of BaTiO3 in the tetragonal phase in contact with Fe, including the effect of depolarizing field. The spectra of the absorbed power in FMR are found to be sensitive to the orientation of the interface electric polarization and to an applied static electric field. Here we propose a method for measuring the magnetoelectric coupling coefficient by means of FMR.