Spin-wave resonance in Co/Pd magnetic multilayers and NiFe/Cu/NiFe three-layered films

The spectrum of standing spin waves has been detected by the ferromagnetic resonance method in NiFe(740 A)/Cu/NiFe(740 A) three-layered film structure in the perpendicular configuration for the copper thickness d Cu ≤ 30 A. At thicknesses d Cu > 30 A, the resonance absorption curve is a superposition of two spinwave resonance spectra from individual ferromagnetic NiFe layers. For Co/Pd multilayer films, united spinwave responance spectra have also been observed at thicknesses of the paramagnetic palladium layer up to d Pd d c).