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arXiv · 2209.02282

Enhancement of spin-orbit torque efficiency by tailoring interfacial spin-orbit coupling in Pt-based magnetic multilayers

Wenqiang Wang·Kaiyuan Zhou·Xiang Zhan·Zui Tao·Qingwei Fu·Like Liang·Zishuang Li·Lina Chen·Chunjie Yan·Haotian Li·Tiejun Zhou·Ronghua Liu
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Abstract

We study inserting Co layer thickness-dependent spin transport and spin-orbit torques (SOTs) in the Pt/Co/Py trilayers by spin-torque ferromagnetic resonance. The interfacial perpendicular magnetic anisotropy energy density ($K_s = 2.7~erg/cm^2$), which is dominated by interfacial spin-orbit coupling (ISOC) in the Pt/Co interface, total effective spin-mixing conductance ($G_{eff,tot} = 0.42 {\times} 10^{15}~{\Omega}^{-1} m^{-2}$) and two-magnon scattering (${\beta}_{TMS} = 0.46~nm^2$) are first characterized, and the damping-like torque (${\xi}_{DL}$ = 0.103) and field-like torque (${\xi}_{FL}$ = -0.017) efficiencies are also calculated quantitatively by varying the thickness of the inserting Co layer. The significant enhancement of ${\xi}_{DL}$ and ${\xi}_{FL}$ in Pt/Co/Py than Pt/Py bilayer system originates from the interfacial Rashba-Edelstein effect due to the strong ISOC between Co-3d and Pt-5d orbitals at the Pt/Co interface. Additionally, we find a considerable out-of-plane spin polarization SOT, which is ascribed to the spin anomalous Hall effect and possible spin precession effect due to IPMA-induced perpendicular magnetization at the Pt/Co interface. Our results demonstrate that the ISOC of the Pt/Co interface plays a vital role in spin transport and SOTs-generation. Our finds offer an alternative approach to improve the conventional SOTs efficiencies and generate unconventional SOTs with out-of-plane spin polarization to develop low power Pt-based spintronic via tailoring the Pt/FM interface.

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Wenqiang Wang, Kaiyuan Zhou, Xiang Zhan, Zui Tao, Qingwei Fu, Like Liang, Zishuang Li, Lina Chen, Chunjie Yan, Haotian Li, Tiejun Zhou, Ronghua Liu. 2022-09-06. Enhancement of spin-orbit torque efficiency by tailoring interfacial spin-orbit coupling in Pt-based magnetic multilayers. https://doi.org/10.1088/1674-1056/ac76aa

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