Electron Magnetic Resonance Studies of Permalloy Meta Surfaces

Systems with coupling between magnetic and plasmonic effects can bring new developments in fields of plasmonics and magnetics. In our work we fabricate and study permalloy surfaces with one-dimensional profile modulation and various modulation parameters. Using optical characterization and ferromagnetic resonance methods, we show that such metasurfaces demonstrate in-plane magnetic anisotropy determined by the structural geometry, and support both spin-wave and surface plasmon polariton resonances determined by the modulation parameters and sample orientation. Those systems also demonstrate low field signals which depend on the magnetic history, are different at differrent geometries, and correspond well to hysteresis curves in photovoltage experiments.