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  • Title: Collinear Spin Current Induced by Artificial Modulation of Interfacial Symmetry.
    Author: Li Z, Zhang Z, Wei M, Lu X, Li T, Zhou J, Yan Y, Du J, Wang X, Li Y, He L, Wu J, Gao Y, Zhang R, Xu Y.
    Journal: Adv Sci (Weinh); 2024 Nov; 11(43):e2406924. PubMed ID: 39316064.
    Abstract:
    Current induced spin-orbit torque (SOT) manipulation of magnetization is pivotal in spintronic devices. However, its application for perpendicular magnetic anisotropy magnets, crucial for high-density storage and memory devices, remains nondeterministic and inefficient. Here, a highly efficient approach is demonstrated to generate collinear spin currents by artificial modulation of interfacial symmetry, achieving 100% current-induced field-free SOT switching in CoFeB multilayers with perpendicular magnetization on stepped Al2O3 substrates. This field-free switching is primarily driven by the out-of-plane anti-damping SOT generated by the planar spin Hall effect (PSHE), resulting from reduced interface symmetry due to orientation-determined steps. Microscopic theoretical analysis confirms the presence and significance of PSHE in this process. Notably, this method for generating out-of-plane spin polarization along the collinear direction of the spin-current with artificial modulation of interfacial symmetry, overcomes inherent material symmetry constraints. These findings provide a promising avenue for universal control of spin-orbit torque, addressing challenges associated with low crystal symmetry and highlighting its great potential to advance the development of energy-efficient spintronic devices technology.
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