Microwave properties of metallic nanowires

We report on the microwave properties of arrays of parallel magnetic nanowi res constituted of nickel, cobalt, or Ni/Fe alloy embedded in nanoporous tr ack-etched polymer membranes. The experiments consist of transmission measu rements carried out on microwave stripline structures using a magnetically loaded membrane as the substrate. Measurements were performed at frequencie s ranging from 100 MHz to 40 GHz and under static magnetic fields up to 5.6 kOe applied along the wires axis. Resonance phenomena have been observed i n the magnitude of the complex transmission coefficient at frequencies whic h depend on the nature of the material and applied static magnetic field. R esults are consistent with those expected for a ferromagnetic resonance (FM R) experiment and the observed behaviors are analyzed in the framework of t he classical FMR theory. (C) 1999 American Institute of Physics. [S0003-695 1(99)02338-4].