Probing Chirality Induced Spin Selectivity in Chiral 2D Hybrid Perovskites Using Spin Hall Magnetoresistance*

The emergence of the Chirality Induced Spin Selectivity (CISS) effect, where electron transport through chiral materials is spin filtered, offers many new and exciting opportunities for the field of spintronics. However, many questions surrounding the exact nature of this physical phenomenon still remain. Here, we employ spin Hall magnetoresistance (SHMR) measurements and use pure spin currents for probing the effective magnetic fields native to the chiral two-dimensional hybrid perovskites as predicted by the CISS effect. Chiral 2D perovskites are spin coated on top of Pt Hall bars on a Si/SiO₂ substrate and the Pt resistance is measured using lock-in detection to separate the first and second harmonic dependencies as a function of magnetic field, field angle, and temperature. We find significant SHMR signals despite the lack of any ferromagnetic material, as well as exotic hysteretic behaviors that we attribute to a CISS-induced SHMR. This work helps to elucidate the mechanism of CISS and paves the way for the use of chiral hybrid perovskites for novel spintronic devices.