提高平凡自旋厄尔材料中z自旋产生效率以实现可扩展、高效、无场且完整的自旋轨道扭矩开关应用
摘要
Despite the remarkable efforts in the past two decades, it has remained a major challenge to achieve switching of perpendicularly magnetized spin-orbit torque devices in a scalable, energy-efficient, field-free, integration-friendly, and complete manner. Here, we report giant enhancement of z spin generation in low-resistivity spin Hall metal/FeCoB devices by alloying the spin Hall metal Pt with Ti and by electric asymmetry engineering. The dampinglike spin torques of z spins and y spins are enhanced by 6 and 3 times relative to that of conventional Pt/FeCoB and enable complete, record-low-power, deterministic switching of FeCoB devices with strong perpendicular magnetic anisotropy and high coercivity. The Pt75Ti25/FeCoB heterostructure also exhibits relatively low resistivity, wafer-scale uniform sputter-deposition on silicon oxide, good compatibility with magnetic tunnel junctions, and excellent thermal stability of exceeding 400 C. These results unambiguously establish the Pt75Ti25/FeCoB as the most compelling candidate for solving the bottleneck of scalable, energy-efficient, field-free, integration-friendly, and complete spin-orbit torque switching technologies. This work also provides a universal strategy for developing high-performance generators of z spin current and will stimulate the exploration of exotic spin currents by alloying trivial spin Hall materials.
引用
@article{arxiv.2506.06628,
title = {Enhancing z spin generation in trivial spin Hall materials for scalable, energy-efficient, field-free, complete spin-orbit torque switching applications},
author = {Qianbiao Liu and Lijun Zhu},
journal= {arXiv preprint arXiv:2506.06628},
year = {2025}
}