Dual driving of magnetostatic modes in yttrium–iron–garnet film experiments

Abstract

We study experimentally the behavior of magnetostatic wave modes in a rectangular yttrium–iron–garnet film placed in an in-plane magnetic field and subject to multiple drive excitations. Patterned slotlines and coplanar waveguides are used to drive the film with microwave (2–4 GHz) excitations corresponding to magnetostatic wave modes. For a single drive, we observe linear transmission at low drive powers and saturation above the Suhl instability. For sufficiently large powers above the instability, the transmitted power through the film displays periodic low-frequency (kHz) auto-oscillations. A second microwave drive applied to the sample is used to excite additional spin-wave modes that interact with those arising from the original excitation. Such dual-drive experiments can probe the nature of spin-wave mode interactions at high amplitudes.