Effective spin-mixing conductance of heavy-metal-ferromagnet interfaces

Abstract

The effective spin-mixing conductance (G_eff) of a heavy metal/ferromagnet (HM/FM) interface characterizes the efficiency of the interfacial spin transport.Accurately determining G_eff is critical to the quantitative understanding of measurements of direct and inverse spin Hall effects. G_eff is typically ascertained from the inverse dependence of magnetic damping on the FM thickness under the assumption that spin pumping is the dominant mechanism affecting this dependence.Here we report that, this assumption fails badly in many in-plane magnetized prototypical HM/FM systems in the nm-scale thickness regime. Instead, the majority of the damping is from two-magnon scattering at the FM interface, while spin-memory-loss scattering at the interface can also be significant.If these two effects are neglected, the results will be an unphysical "giant" apparent G_eff and hence considerable underestimation of both the spin Hall ratio and the spin Hall conductivity in inverse/direct spin Hall experiments.

References in corpus (10)

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• Spin-orbit torques in heavy metal/ferromagnet bilayers with varying strength of interfacial spin-orbit coupling
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• Spin-memory loss due to spin-orbit coupling at ferromagnet/heavy-metal interfaces: Ab initio spin-density matrix approach
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• Enhancement of spin transparency by interfacial alloying
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Cited by in corpus (49)

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• Coherent spin pumping in a strongly coupled magnon-magnon hybrid system
• 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
• Maximizing the spin-orbit torque efficiency of Pt/Ti multilayers by optimization of the tradeoff between the intrinsic spin Hall conductivity and carrier lifetime
• Large spin Hall magnetoresistance in antiferromagnetic α-Fe2O3/Pt heterostructures
• Observation of strong bulk damping-like spin-orbit torque in chemically disordered ferromagnetic single layers
• Transverse and Longitudinal Spin-Torque Ferromagnetic Resonance for Improved Measurements of Spin-Orbit Torques
• Energy-efficient ultrafast SOT-MRAMs based on low-resistivity spin Hall metal Au0.25Pt0.75
• Toward 100% Spin-Orbit Torque Efficiency with High Spin-Orbital Hall Conductivity Pt-Cr Alloys
• Large spin-to-charge conversion at room temperature in extended epitaxial Sb2Te3 topological insulator chemically grown on Silicon
• Origin of Strong Two-Magnon Scattering in Heavy Metal/Ferromagnet/Oxide Heterostructures
• Dephasing of Transverse Spin Current in Ferrimagnetic Alloys
• Strong variation of spin-orbit torques with relative spin relaxation rates in ferrimagnets
• Spin-orbit torques originating from bulk and interface in Pt-based structures
• Unveiling the mechanism of bulk spin-orbit torques within chemically disordered Fe${}_x$Pt${}_{1-x}$ single layers
• Large and Robust Charge-to-Spin Conversion in Sputtered Conductive WTex with Disorder
• Absence of significant spin current generation in Ti/FeCoB bilayers with strong interfacial spin-orbit coupling
• Strong Spin-Orbit Torque Induced by the Intrinsic Spin Hall Effect in Cr1-xPtx
• Interfacial Dzyaloshinskii-Moriya interaction and spin-orbit torque in Au1-xPtx/Co bilayers with varying interfacial spin-orbit coupling
• Current-induced perpendicular effective magnetic field in magnetic heterostructures
• Role of interfacial oxidation in generation of spin-orbit torques
• Interlayer exchange coupling through Ir-doped Cu spin Hall material
• Boosting spin-orbit torque efficiency in spin-current generator/magnet/oxide superlattices
• Effective spin-mixing conductance of topological-insulator/ferromagnet and heavy-metal/ferromagnet spin-orbit-coupled interfaces: A first-principles Floquet-nonequilibrium-Green-function approach
• Charge-Spin Interconversion in Epitaxial Pt Probed by Spin-Orbit Torques in a Magnetic Insulator
• Bulk and interface spin-orbit torques in Pt/Co/MgO thin film structures
• Anomalous sign inversion of spin-orbit torque in ferromagnetic/nonmagnetic bilayer systems due to self-induced spin-orbit torque
• Measurement of the Spin Absorption Anisotropy in Lateral Spin Valves
• Unified Framework for Charge-Spin Interconversion in Spin-Orbit Materials
• Damping enhancement in coherent ferrite/insulating-paramagnet bilayers
• Spin-memory loss induced by bulk spin-orbit coupling at ferromagnet/heavy-metal interfaces
• Enhancement of YIG$|$Pt spin conductance by local Joule annealing
• Enhancement of spin mixing conductance in La${}_{0.7}$Sr${}_{0.3}$MnO${}_3$/LaNiO${}_3$/SrRuO${}_3$ heterostructures
• Elasto-Dynamical Induced Spin and Charge Pumping in Bulk Heavy Metals
• Vertically Graded Fe-Ni Alloys with Low Damping and a Sizeable Spin-Orbit Torque
• Nonreciprocal spin-charge interconversion in topological insulator/ferromagnet heterostructures
• Spin pumping from antiferromagnetic insulator spin-orbit-proximitized by adjacent heavy metal: A first-principles Floquet-nonequilibrium Green's function study
• Impact of inherent energy barrier on spin-orbit torques in magnetic-metal/semimetal heterojunctions
• Enhancement of spin-orbit torque efficiency by tailoring interfacial spin-orbit coupling in Pt-based magnetic multilayers
• Enhancement of spin mixing conductance by $s$-$d$ orbital hybridization in heavy metals
• Enhancing z spin generation in trivial spin Hall materials for scalable, energy-efficient, field-free, complete spin-orbit torque switching applications
• Resonant Measurement of Non-Reorientable Spin-Orbit Torque from a Ferromagnetic Source Layer Accounting for Dynamic Spin Pumping
• Suppression of Spin Pumping at Metal Interfaces
• Polar and quadratic magneto-optical Kerr effects in nonmagnetic/ferromagnet bilayers for spin-orbit torque measurements