Resonances in Ferromagnetic Gratings Detected by Microwave Photoconductivity

Institut fu¨r Angewandte Physik und Zentrum fu¨r Mikrostrukturforschung,Universit¨at Hamburg, Jungiusstrase 11, 20355 Hamburg, Germany(Dated: February 2, 2008)We investigate the impact of microwave excited spin excitations on the DC charge transport ina ferromagnetic (FM) grating. We observe both resonant and nonresonant microwave photoresis-tance. Resonant features are identified as the ferromagnetic resonance (FMR) and ferromagneticantiresonance (FMAR). A macroscopic model based on Maxwell and Landau-Lifschitz equationsreveals the macroscopic nature of the FMAR. The experimental approach and results provide newinsight in the interplay between photonic, spintronic, and charge effects in FM microstructures.