Magnetoresistance of (CH3NH3)PbI3-Coated La0.67Sr0.33MnO3 Granular Composites

We prepared CH₃NH₃PbI₃-coated La_0.67Sr_0.33MnO₃ (LSMO) granular composites. Significant magnetoresistance (MR) effect has been observed. The resistivity of CH₃NH₃PbI₃-coated LSMO is more than five orders larger than that of LSMO. The MR effect from LSMO bulk can be safely excluded. The MR curves can be separated into two parts: 1) low-field MR (LFMR) and 2) high-field MR (HFMR). LFMR can be attributed to the spin retaining transport in CH₃NH₃PbI₃ and spin-dependent scattering at the LSMO particle surface, and the HFMR can be explained by the field-dependent carrier injection at the interface of LSMO and CH₃NH₃PbI₃. The observation of MR in CH₃NH₃PbI₃-coated LSMO granular composites demonstrates the potential application of organolead trihalide perovskite as spin transporting medium in organic spintronics.