Scaling behavior of giant magnetotransport effects in Co/Cu superlattices

We have observed two forms of scaling in magnetotransport properties of (111) Co/Cu superlattices: (1) the extraoridnary Hall coefficient Rₛ correlates with the resistivity ρₓₓ(0) in the form Rₛ{~}ρₓₓ²(0), and (2) the magnetothermopower S(H) correlates with the magnetoresistivity ρₓₓ(H) in the form S(H)/T{~}ρₓₓ(0)/ρₓₓ(H). The first effect relates to quantum mechanical side jump while the other relates to interfacial spin-dependent density of states (DOS). These results revel the different roles of bulklike spin-dependent scattering in Co layers and spin-dependent DOS of interfacial layers in causing the observed large positive extraodinary Hall effect and giant longitudinal magnetotransport.