Ferromagnetic resonance in bulk-acoustic wave multiferroic devices

Abstract

The effect of ferromagnetic resonance (FMR) on the magneto-mechanical coupling in thin-film multiferroic bulk-acoustic wave (BAW) devices is demonstrated. Devices consisting of piezoelectric and magneto-elastic materials are fabricated, and their electrical response is measured as a function of applied magnetic field magnitude and angle. As the applied magnetic field aligns the FMR frequency of the magneto-elastic layer with that of the BAW resonance of the structure, peaks in device conductance are observed. Approximate micro-magnetic simulations reproduce the trends seen experimentally. This represents the first investigation in the magneto-elastic coupling in thin-film BAW devices for potential applications for radio frequency (RF) miniature multiferroic devices.