Thermal spin-transfer torque driven by Chirality Induced Spin Selectivity effect in layered chiral hybrid perovskite*

Thermal spin-transfer torque (STT), the transfer of the spin current mediated by heat current, provides a new way to control the orientation of nanomagnets. The recent discovery of the Chiral-Induced Spin Selectivity (CISS) effect offers an opportunity to create spin current in chiral materials without the need of ferromagnet elements, e.g., chiral (left- or right-handed) molecules. In the presence of electron transport mediated by heat current, the chiral materials would produce a spin current via CISS effect, of which the spin polarization determined by handedness of the material. Here we study the CISS effect in solution-processed, 2D-layered, hybrid perovskite materials incorporating chiral molecule ligands, sensed by the thermal STT signal using ultrafast Time-Resolved Magneto-Optical Kerr Effect (TR-MOKE) technique. The chirality-dependent precession of the magnetization in the ferromagnet layer on top of layered chiral hybrid perovskites were observed which is attributed to the CISS effect. Our work opens a new route for the use of layered chiral hybrid perovskite materials for novel STT devices. K.K., E.V., and L.Y. contributed to this work equally.