Abstract

A planar stripline was used to inject microwaves into thin film crystals of Yttrium Iron Garnet (YIG) in a time varied magnetic field to observe ferromagnetic resonance (FMR). From the resonant response of the sample, we extracted the Gilbert Damping Coefficient of a 3μm thick YIG to be (1.9 ± 0.2) ∗ 10−3. With this coefficient determined, we increased the input microwave frequency and power in attempt to observe nonlinear FMR phenomena, such as spin-wave coupling, which are expected to be prominent in YIG, and non-linear two-magnon damping was observed. The observation of nonlinear phenomena will help to probe extrinsic and intrinsic contributions to the Gilbert Damping which are facilitated by crystalline impurities.