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Enhancing Rashba Spin-Splitting Strength by Orbital Hybridization
ACS Nano ( IF 15.8 ) Pub Date : 2024-12-20 , DOI: 10.1021/acsnano.4c12543 Qihan Zhang, Peng Li, Heng-An Zhou, Zhenyi Zheng, Junwei Zeng, Jiahao Liu, Tieyang Zhao, Lanxin Jia, Rui Xiao, Liang Liu, Hongxin Yang, Jingsheng Chen
ACS Nano ( IF 15.8 ) Pub Date : 2024-12-20 , DOI: 10.1021/acsnano.4c12543 Qihan Zhang, Peng Li, Heng-An Zhou, Zhenyi Zheng, Junwei Zeng, Jiahao Liu, Tieyang Zhao, Lanxin Jia, Rui Xiao, Liang Liu, Hongxin Yang, Jingsheng Chen
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A Rashba spin-splitting state with spin-momentum locking enables the charge–spin interconversion known as the Rashba effect, induced by the interplay of inversion symmetry breaking (ISB) and spin–orbit coupling (SOC). Enhancing spin-splitting strength is promising to achieve high spin–orbit torque (SOT) efficiency for low-power-consumption spintronic devices. However, the energy scale of natural ISB at the interface is relatively small, leading to the weak Rashba effect. In this work, we report that orbital hybridization inducing additional asymmetry potential at the interface observably enhances spin-splitting strength, verified in the hexagonal boron nitride (h-BN)/Co3Pt heterostructures. First-principles calculations suggest the sizable Rashba spin-splitting derived from the out-of-plane p–d hybridization combined with SOC at the h-BN/Co3Pt interface. Then, the SOT efficiency is observably enhanced via the Rashba effect at the h-BN/Co3Pt interface and exhibits unusual temperature dependence, in which the large-area h-BN is in situ grown on the Co3Pt layer with perpendicular magnetic anisotropy by magnetron sputtering. Especially, the dominant damping-like torque is observed, resulting in the lower threshold switching current density and the enhanced switching ratio. Our results provide opportunities for interfacial control to enhance the Rashba effect and the SOT efficiency in heterostructures. It is expected to contribute to the design of energy-efficient spintronic devices.
更新日期：2024-12-20
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