Microwave magnetoelectric interactions in ferrite–piezoelectric nanobilayers: Theory of electric field induced magnetic excitations

A theory for magnetic excitations in a yttrium iron garnet (YIG)–lead zirconate titanate (PZT) nanobilayer due to microwave electric field and magnetoelectric (ME) interactions is discussed. The magnetic response is described by ME susceptibility and a technique has been proposed for its determination. The electric field excites elastic modes in PZT that would result in magnetoelastic modes in YIG. The model predicts maximum ME susceptibility when the microwave field is at the coincidence of electromechanical and magnetic resonance. The theory is of importance for new devices such as magnetoelectric spin-acoustic wave generators and power limiters.