Wide frequency band ESR study of Co - Cu multilayers with variable thickness of Co layers

Layered magnetic/nonmagnetic conductors (Co/Cu, Fe/Ni/Cu, Fe/Cr, others.) excite now certain interest of researches because they show remarkable vary of resistivity while applying the static magnetic field of quite small value (Giant Magnetic Resistance - GMR effect). As well the giant magneto impedance phenomenon (GMI) is revealed for alternative current. Study of nature of GMI phenomenon promising to give a certain profit for high-frequency physics and technology, especially millimeter wavelength band on the reason of very small switching time restricted mainly the spin-spin relaxation time of the multilayers material (10''-''9s - 10''-''1''3s). Therefore the study of magnetic properties of such structures by high-frequency techniques and in the frequency band of their presumptive application is of large significance. In this report a results of study some key features of Co/Cu multilayered structure, by the Electron Spin Resonance (ESR) technique for the frequency range from 9.5 to 37 GHz for variable thickness of magnetic layers are under discussion