Disentangling interface and bulk contributions to the anisotropic magnetoresistance in Pt/Co/Pt sandwiches

We report on interfacial contributions to the anisotropic magnetoresistance (AMR) in Co layers sandwichedbetween Pt. Utilizing the Fuchs-Sondheimer formalism interface contributions can be separated from bulklikeAMR. We demonstrate that for all-metal systems interfacial AMR is also present when varying the magnetizationwithin the film plane. This interfacial in-plane AMR is two times smaller than the contribution that arises whenthe magnetization is varied within the plane perpendicular to the current direction. This finding is in contrast tothe spin Hall MR found for ferromagnetic insulator/Pt bilayers revealing the existence of different MR effects atthe interfaces of Pt with conducting and insulating ferromagnets