Spin-orbit torques in heavy metal/ferromagnet bilayers with varying strength of interfacial spin-orbit coupling

Abstract

Despite intense efforts it has remained unresolved whether and how interfacial spin-orbit coupling (ISOC) affects spin transport across heavy metal (HM)/ferromagnet (FM) interfaces. Here we report conclusive experiment evidence that the ISOC at HM/FM interfaces is the dominant mechanism for "spin memory loss". An increase in ISOC significantly reduces, in a linear manner, the dampinglike spin-orbit torque (SOT) exerted on the FM layer via degradation of the spin transparency of the interface for spin currents generated in the HM. In addition, the fieldlike SOT is also dominated by the spin Hall contribution of the HM and decreases with increasing ISOC. This work reveals that ISOC at HM/FM interfaces should be minimized to advance efficient SOT devices through atomic layer passivation of the HM/FM interface or other means.

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Cited by in corpus (60)

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• Effective spin-mixing conductance of heavy-metal-ferromagnet interfaces
• Strong damping-like spin-orbit torque and tunable Dzyaloshinskii-Moriya interaction generated by low-resistivity Pd${}_{1-x}$Pt${}_x$ alloys
• Theory of Current-Induced Angular Momentum Transfer Dynamics in Spin-Orbit Coupled Systems
• Maximizing Spin-Orbit Torque Generated by the Spin Hall Effect of Pt
• Fully Spin-transparent magnetic interfaces enabled by insertion of a paramagnetic NiO layer
• Switching of Perpendicular Magnetization by Spin-Orbit Torque
• Disorder Dependence of Interface Spin Memory Loss
• Enhancing spin-orbit torque by strong interfacial scattering from ultra-thin insertion layers
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• Origin of Strong Two-Magnon Scattering in Heavy Metal/Ferromagnet/Oxide Heterostructures
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• Strong variation of spin-orbit torques with relative spin relaxation rates in ferrimagnets
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• Emerging spintronics phenomena and applications
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• Experimental evidence of spin-orbit torque from metallic interfaces
• Spin-orbit torques and their associated effective fields from gigahertz to terahertz
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• Spin-orbit induced equilibrium spin currents in materials
• Highly fcc-textured Pt-Al alloy films grown on MgO(001) showing enhanced spin Hall efficiency
• Room temperature spin-orbit torque efficiency and magnetization switching in SrRuO3-based heterostructures
• Lossless Spin-Orbit Torque in Antiferromagnetic Topological Insulator MnBi${}_2$Te${}_4$
• Lead-free Hybrid Perovskite: An Efficient Room Temperature Spin Generator via Large Interfacial Rashba effect
• Interfacial Spin-Orbit Torques and Magnetic Anisotropy in WSe${}_2$/Permalloy Bilayers
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• Quantum Scattering Theory of Spin Transfer Torque, Spin Pumping and Fluctuations
• Controllable Spin Current in van der Waals Ferromagnet Fe3GeTe2
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• Detection of field-free magnetization switching through thermoelectric effect in Ta/Pt/Co/Pt with significant spin-orbit torque and competing spin currents
• Enhanced spin transfer torque in platinum/ferromagnetic-metal structures by optimizing the platinum thickness
• Intrinsic nature of the giant spin Hall conductivity of Pt
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• Electronic Impurity Scattering Induced Spin Accumulation in Metallic Thin Films
• Negligible current-induced torque from the bulk and interface of Al
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