Interaction of electromagnetic waves with iron-chromium multilayer nanostructures

Interaction of traveling electromagnetic waves with MBE-grown Fe/Cr multilayer nanostructures is studied. Measurements are made in the frequency range 5.7–12.5 GHz at magnetic fields of up to 32 kOe. It is found that the dependence of the microwave transmission coefficient on the external magnetic field intensity is similar to the field dependence of the dc giant magnetoresistive effect. As a result of the interaction, the wavenumber varies in proportion to the electrical resistance of the structure. A simulation of the magnetic fields shows that the microwave currents flow largely across the multilayer nanostructure (normally to the layers).