Studies of magnetoresistance in organometal halide perovskite based spin-valves**

Lead-based organometal halide perovskites (OHP) have recently attracted substantial research interest due to their potential photovoltaic and optoelectronic applications as well as non-traditional semiconductor physics. The carrier spin characteristic properties in these compounds are influenced by the large spin-orbit coupling of the Pb and halogen atoms, and consequently offer a new class of semiconductors for spintronic applications. We have studied magnetoresistance (MR) in OHP-based spin-valves using LSMO/OHP/Co trilayer devices. We report sizable `giant-MR' and `tunneling-MR' in spin-valves based on several 3D and 2D OHP active layers. The two types of MR responses were studied and compared as a function of the applied bias voltage and temperature, respectively. *Supported by the DOE grant DE-SC0014579 and NSF-MRSEC (DMR-1121252).