Enhancing Room-Temperature Magnetic Properties and Non-Centrosymmetric Distortion in Chiral Metal Halide Perovskites
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Control of spin-polarized currents and magnetic properties are important to demonstrate various spintronic applications. Here, we report novel hybrid chiral metal-halide perovskites (MHPs), which can simply control the spin polarization and magnetic properties. First, we synthesize Pb-free chiral MHPs that use M (M=divalent transition metal) in B site cation. M-based MHPs have 0D orientation of M-halide square-planar, where the direction of the orientation depends on the chiral direction in A-site cation, and increased g-factor when X-site are mixed halides. We also measured the spin selectivity. Second, to induce magnetic properties in chiral MHPs, we synthesize M'/M"-based (M', M" = trivalent transition metals) chiral MHPs with different M'/M" ratio. M'/M"-based chiral MHPs exhibit CD signals within the absorption range of metal-halide tetrahedra and demonstrate superparamagnetic at RT, showcasing the potential of future MHP materials combining chirality and magnetic properties.