Hybrid magnetoresistance in the proximity of a ferromagnet

We report a new magnetoresistance (MR) effect observed in a nominally nonmagnetic metal (Pt) thin film in contact with either a ferromagnetic insulator or a ferromagnetic metal. The resistivities with in-plane magnetic fields parallel (rho(parallel to)) and transverse (rho(T)) to a current and a perpendicular field (rho(perpendicular to)) show the behavior of rho(perpendicular to) approximate to rho(parallel to) > rho(T), distinctly different from all other known MR effects, including anisotropic MR with rho(parallel to) > rho(T) approximate to rho(perpendicular to). We termed the new MR as hybrid MR, which appears in a metal in close proximity with a ferromagnet either insulating or metallic, and is associated with the induced magnetic moments at the interface.