Magnetoresistance of ultrathin Co/Au(111) multilayers
MetadataShow full item record
This Chapter presents experimental and theoretical aspects of the longitudinal magnetoresistance (MR) of gold cobalt Co/Au(111) multilayers composed of ultrathin ferromagnetic layers of cobalt alternating with thick gold layers. MR and magnetization measurements by SQUID have been performed on Au/Co/Au/Co/Au multi-layers. These experiments confirm the mechanism of spindependent diffusion at the interfaces leading to the increase of the resistance when the two magnetic layers have anti-parallel magnetization The MR effect is analyzed by a semi-classical theory of the resistivity of multi-layers with spin dependent Scattering at the interfaces Au-Co. This interfacial spin dependent scattering is related to the geometric random roughness. The comparison experience-theory shows a satisfying agreement. We establish in particular, a phenomenological relation between MR and reduced magnetizations of cobalt layers, which permits to describe the general behavior of MR effect.