Chirality-induced spin-Hall magnetoresistance in 2D chiral hybrid perovskites

2D ferromagnetism is an emerging field in spintronics applications. The use of generic 2D ferromagnetic materials, however, suffers of the so-called ‘superparamagnetic limit’, which imposes restrictions on the size and dimension of the ferromagnetic component used in spintronics devices. The recent discovery of the Chiral-Induced Spin Selectivity (CISS) effect offers a possibility to generate spin angular momentum by replacing the ferromagnetic component with chiral systems, e.g., chiral (left- or right-handed) molecules and their assemblies lacking inversion symmetry. As a result of the CISS effect, the chiral materials can produce an effective magnetic field at room temperature, which direction is determined by the left or right chirality, circumventing the ‘superparamagnetic limit’. Here, we report the observation of a large chiral-induced magnetic field up to 4 Tesla in solution-processed, 2D-layered, organic-inorganic hybrid perovskites incorporating chiral molecule ligands. Such chiral-induced magnetic field is probed by measuring the resistance through an attached platinum layer, analogous with the spin- Hall magnetoresistance (SMR). We found a substantial angular dependent chirality-induced SMR that agrees well with theoretical models. By sweeping the magnetic field, the SMR reveals a clear hysteresis depending upon the chirality of 2D perovskites, which could be used to quantify the effective magnetic field strength produced via the CISS effect. Incorporating the chiral molecules into a 2D layered hybrid perovskite framework offers a versatile platform for designing 2D ferromagnetic materials at room temperature. \\ \\ In collaboration with: Eric Vetter, North Carolina State University, Yan Liang, University of North Carolina at Chapel Hill, Yuzan Xiong, Oakland University, Shulei Zhang, Zhizhi Zhang, Oakland University, Yi Li, Oakland University and Argonne National Laboratory, Hongwei Qu, Oakland University, Valentine Novosad, Axel Hoffmann, Argonne National Laboratory, Wei You, University of North Carolina at Chapel Hill, Wei Zhang, Oakland University. \\ Acknowledgement: E.V. and D.S. were thankful for the start-up support provided by North Carolina State University and NC State-Nagoya Collaboration Grant. Work at Oakland University was supported by AFOSR under no. FA9550-19-1-0254. Work at Argonne was supported by the Department of Energy, Office of Science, Materials Science and Engineering Division.