Ferromagnetic resonance in submicron metallic wires

We report on the microwave properties of a nanostructured magnetic planar s ubstrate. It consists of an array of parallel magnetic nanowires constitute d of nickel, cobalt or Ni/Fe alloy embedded in a porous polymer membrane, E xperiments consist in transmission measurements carried out on microwave st ripline, Measurements were performed at frequencies ranging from 100 MHz to 40 GHz and under static magnetic fields up to 5.6 kOe applied along the wi res axis. Resonance phenomena have been observed in the presence but also i n the absence of the DC magnetic field at frequencies which depend on the n ature of the material and the applied static magnetic field. Results are co nsistent with those expected for a ferromagnetic resonance (FMR) experiment and the observed behaviors and analyzed in the framework of the classical FMR theory.