Two-Dimensional Perovskite Chiral Ferromagnets

Magnetic
molecular materials with a chiral configuration are attractive
candidates for sensing, information storage, and spintronics. Herein,
we report the first example of two-dimensional hybrid perovskite chiral
ferromagnets, (R-MPEA)2CuCl4 and (S-MPEA)2CuCl4. These
two compounds exhibit strong oppositely signed circular dichroism
signals and clear ferromagnetic behaviors. Magnetic measurements revealed
high saturation magnetization up to 12.5 emu g–1. The coexistence of strong chirality and ferromagnetism enabled
successful study on their magneto-chiral dichroism spectra. These
findings demonstrate a new materials platform for future magneto-optical
and spintronic applications, providing insights to the structure–property
correlation of chiral ferromagnetic perovskite.

具有手性构型的磁性分子材料，是传感、信息存储与自旋电子学领域极具吸引力的候选材料。本文首次报道了二维杂化钙钛矿手性铁磁体的首个实例：(R-MPEA)₂CuCl₄与(S-MPEA)₂CuCl₄。这两种化合物展现出强烈且符号相反的圆二色性（Circular Dichroism）信号，同时呈现出清晰的铁磁行为。磁学测量结果表明，其饱和磁化强度最高可达12.5 emu·g⁻¹。强手性与铁磁性的共存特性，使得我们能够成功开展其磁手性二色性（Magneto-Chiral Dichroism）光谱的相关研究。本研究成果为未来磁光与自旋电子学应用提供了全新的材料平台，同时为手性铁磁杂化钙钛矿的构效关系研究提供了重要见解。