Multifield Modulation of Resistance States in a Spin Valve Based on Chiral Perovskites.

Spin valves are conventionally limited to binary resistance states controlled solely by magnetic fields, restricting their functional versatility and integration density. Here, we demonstrate a spin valve using a vertically aligned, chiral hybrid perovskite as the spacer, which integrates circularly polarized light as an additional control dimension. The device exhibits a magnetoresistance ratio of ∼5% at 10 K. Due to the intrinsic circular dichroism of the perovskite, circularly polarized light illumination induces a chirality-dependent photovoltaic effect that selectively modulates the baseline device resistance. Specifically, (S/R-NEA)FAPbBr-based devices respond more strongly to left- and right-handed circularly polarized light, respectively. By combining magnetic field switching (parallel/antiparallel states) and optical control (dark, σ, σ illumination), we achieve up to six distinct, nonvolatile resistance levels within a single device. This work demonstrates that chiral perovskites are promising candidates for high-density multistate memory and novel spin-optoelectronic logic.