SCALING BEHAVIOR OF GIANT MAGNETOTRANSPORT EFFECTS IN CO CU SUPERLATTICES/

We have observed two forms of scaling in magnetotransport properties o f (111) Co/Cu superlattices: (1) the extraordinary Hall coefficient R( s) correlates with the resistivity rho(xx)(0) in the form R(s) is simi lar to rho(xx)2(0), and (2) the magnetothermopower S(H) correlates wit h the magnetoresistivity rho(xx)(H) in the form S(H)/T is similar to r ho(xx)(0)/rho(xx)(H). The first effect relates to quantum mechanical s ide jump while the other relates to interfacial spin-dependent density of states (DOS). These results reveal the different roles of bulklike spin-dependent scattering in Co layers and spin-dependent DOS of inte rfacial layers in causing the observed large positive extraordinary Ha ll effect and giant longitudinal magnetotransport.