Anomalous transverse magnetoresistance in superconductor/ferromagnet multilayers

We have studied the magnetoresistance of metallic multilayers composed of a low-T_c superconductor (MoSi) and different ferromagnets (from single Co layers to combinations of these with heavy-elements) which present variable magnetic anisotropy and domain structure. In some cases, the longitudinal magnetoresistance shows a strong magnetic hysteresis that results from the interaction of flux quanta in the superconductor and the stray field from the ferromagnet's domains. Interestingly, that behavior is accompanied by an anomalous transverse magnetoresistance whose parity depends on the direction of the magnetic field relative to the ferromagnet's easy axis. We will discuss the different scenarios allowing for an understanding of these effects.