Spin wave resonance in FeNi multilayers

Abstract The spin wave resonance (SWR) at 9.2 GHz has been investigated in a multilayer structure of 190 nm overall thickness composed of alternating films of Fe (8 nm) and Ni (10 nm). At room temperature three different resonances are observed in the parallel as well as in the perpendicular configuration. With the external field perpendicular to the film plane, standing spin wave patterns can be resolved. The most intriguing result is the observation of a SWR fine structure which can be attributed to standing spin waves between the different individual Fe and Ni layers.