Irrelevance of magnetic proximity effect to spin-orbit torques in heavy metal/ferromagnet bilayers

Abstract

The magnetic proximity effect (MPE) is a well-established magnetic phenomenon that occurs at certain heavy metal (HM)/ferromagnet (FM) interfaces. However, there is still an active debate as to whether the presence of a MPE affects spin transport through such a HM/FM interface. Here we demonstrate that the MPE at Pt/Co and Au0.25Pt0.75/Co interfaces can be enhanced substantially by thermal annealing protocols. From this ability, we show that the MPE has no discernable influence on either the damping-like or the field-like spin-orbit torques exerted on the FM layer due to the spin Hall effect of the HM layer, indicating a minimal role of the MPE compared to other interfacial effects, e.g. spin memory loss and spin backflow.

References in corpus (6)

• Interface enhancement of Gilbert damping from first-principles
• Modification of perpendicular magnetic anisotropy and domain wall velocity in Pt/Co/Pt by voltage-induced strain
• Spin-memory loss due to spin-orbit coupling at ferromagnet/heavy-metal interfaces: Ab initio spin-density matrix approach
• Anomalous Nernst and Hall effects in magnetized platinum and palladium
• Ballistic spin transport in the presence of interfaces with strong spin-orbit coupling
• Suppression of the fieldlike spin-orbit torque efficiency due to the magnetic proximity effect in ferromagnet/platinum bilayers

Cited by in corpus (21)

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• Maximizing Spin-Orbit Torque Generated by the Spin Hall Effect of Pt
• 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
• Enhancement of spin transparency by interfacial alloying
• Effects of transition-metal spacers on the spin-orbit torques, spin Hall magnetoresistance, and magnetic anisotropy of Pt/Co bilayers
• Field-free spin-orbit torque switching in Co/Pt/Co multilayer with mixed magnetic anisotropies
• Asymmetric modification of the magnetic proximity effect in Pt/Co/Pt trilayers by the insertion of a Ta buffer layer
• Spin-orbit-proximitized ferromagnetic metal by monolayer transition metal dichalcogenide: Atlas of spectral functions, spin textures and spin-orbit torques in Co/MoSe${}_2$, Co/WSe${}_2$ and Co/TaSe${}_2$ heterostructures
• Interfacial Dzyaloshinskii-Moriya interaction and spin-orbit torque in Au1-xPtx/Co bilayers with varying interfacial spin-orbit coupling
• Impact of the magnetic proximity effect in Pt on the total magnetic moment of Pt/Co/Ta trilayers studied by x-ray resonant magnetic reflectivity
• Boosting spin-orbit torque efficiency in spin-current generator/magnet/oxide superlattices
• Quantitative comparison of the magnetic proximity effect in Pt detected by XRMR and XMCD
• Determining complex spin mixing conductance and spin diffusion length from spin pumping experiments in magnetic insulator/heavy metal bilayers
• Phonon-mediated strong coupling between a three-dimensional topological insulator and a two-dimensional antiferromagnetic material
• Calculating interface transport parameters at finite temperatures: Nonmagnetic interfaces
• Temperature dependent spin dynamics in La${}_{0.67}$Sr${}_{0.33}$MnO${}_3$/Pt bilayers
• Intrinsic nature of the giant spin Hall conductivity of Pt
• Unidirectional spin Hall magnetoresistance and spin-orbit torques in HM${}_1$/Co/HM${}_2$ trilayer systems