Large Electric-Field Tunability of Ferromagnetic Resonance Frequency in Ferromagnet/Piezoelectric Multiferroic Heterostructures

We report our experimental observation of a large electrical tuning of ferromagnetic resonance frequency in FeCo/MnIr/[Pb(Mg_1/3Nb_2/3)O₃]_0.68-[PbTiO₃ ]_0.32(0 1 1) multiferroic heterostructures. Specifically, by varying an applied electrical field across the thickness of the substrate, the ferromagnetic resonance frequency can be tuned in a wide band from 3.6 to 10.5 GHz. The results are discussed in terms of the strain-mediated magneto-electric coupling between the ferromagnetic thin films and the piezoelectric substrates.