Sun Rui, Wang Ziqi, Bloom Brian P, Comstock Andrew H, Yang Cong, McConnell Aeron, Clever Caleb, Molitoris Mary, Lamont Daniel, Cheng Zhao-Hua, Yuan Zhe, Zhang Wei, Hoffmann Axel, Liu Jun, Waldeck David H, Sun Dali
Department of physics, North Carolina State University, Raleigh, NC 27695, USA.
Organic and Carbon Electronics Laboratories (ORaCEL), North Carolina State University, Raleigh, NC 27695, USA.
Sci Adv. 2024 May 3;10(18):eadn3240. doi: 10.1126/sciadv.adn3240.
The chiral induced spin selectivity (CISS) effect, in which the structural chirality of a material determines the preference for the transmission of electrons with one spin orientation over that of the other, is emerging as a design principle for creating next-generation spintronic devices. CISS implies that the spin preference of chiral structures persists upon injection of pure spin currents and can act as a spin analyzer without the need for a ferromagnet. Here, we report an anomalous spin current absorption in chiral metal oxides that manifests a colossal anisotropic nonlocal Gilbert damping with a maximum-to-minimum ratio of up to 1000%. A twofold symmetry of the damping is shown to result from differential spin transmission and backscattering that arise from chirality-induced spin splitting along the chiral axis. These studies reveal the rich interplay of chirality and spin dynamics and identify how chiral materials can be implemented to direct the transport of spin current.
手性诱导自旋选择性（CISS）效应是指材料的结构手性决定了一种自旋取向的电子比另一种自旋取向的电子更易于传输，它正逐渐成为制造下一代自旋电子器件的设计原则。CISS意味着手性结构的自旋偏好性在注入纯自旋电流时依然存在，并且无需铁磁体就能充当自旋分析仪。在此，我们报道了手性金属氧化物中一种反常的自旋电流吸收现象，其表现出巨大的各向异性非局域吉尔伯特阻尼，最大与最小比率高达1000%。研究表明，阻尼的二重对称性源于沿手性轴的手性诱导自旋分裂所引起的不同自旋传输和背散射。这些研究揭示了手性与自旋动力学之间丰富的相互作用，并确定了如何利用手性材料来引导自旋电流的传输。
