Enhancement of spin transparency by interfacial alloying

Zhu, Lihua; Ralph, Daniel; Buhrman, R. A.

doi:10.1103/physrevb.99.180404

Cited by 69 publications

(96 citation statements)

References 37 publications

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“…The decrease of T int with K s is less likely to suggest a decrease in HM/FM ⇵ here because previous studies have indicated that magnetic roughness (e.g. induced by diffusion) may increase T int via moderately enhancing HM/FM ⇵ [42,43]. Finally, while processes (iii) and (iv) that should increase DL E are still possisible, they seem to be a weaker effect than the SML process as indicated by the decrease of T int with enhancing K s .…”

Section: Influence Of Short-wavelength Magnons On Spin Torquementioning

confidence: 96%

Origin of Strong Two-Magnon Scattering in Heavy-Metal/Ferromagnet/Oxide Heterostructures

Zhu

Ralph

et al. 2020

Phys. Rev. Applied

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We experimentally investigate the origin of the two-magnon scattering (TMS) in heavy-metal (HM)/ferromagnet (FM)/oxide heterostructures (FM = Co, Ni 81 Fe 19 , or Fe 60 Co 20 B 20 ) by varying the materials located above and below the FM layers. We show that strong TMS in HM/FM/oxide systems arises primarily at the HM/FM interface and increases with the strength of interfacial spin-orbit coupling and magnetic roughness at this interface. TMS at the FM/oxide interface is relatively weak, even in systems where spin-orbit coupling at this interface generates strong interfacial magnetic anisotropy. We also suggest that the spin-current-induced excitation of non-uniform short-wavelength magnon at the HM/FM interface may function as a mechanism of spin memory loss for the spin-orbit torque exerted on the uniform mode.

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Section: Influence Of Short-wavelength Magnons On Spin Torquementioning

confidence: 96%

Origin of Strong Two-Magnon Scattering in Heavy-Metal/Ferromagnet/Oxide Heterostructures

Zhu

Ralph

et al. 2020

Phys. Rev. Applied

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“…In contrast, two-magnon scattering (TMS) [29,30] predominantly determines the tFM dependence of α. When ISOC is sufficiently strong, the second largest contribution can be spin memory loss (SML) [12,[31][32][33][34][35]. Neglecting TMS and SML, particularly the former, when analyzing measurements of α in HM/FM systems gives unphysical "giant" estimates for eff ↑↓ and hence incorrect quantification of spin-dependent transport phenomena across HM/FM interfaces and large errors in the determination of θSH and σSH.…”

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confidence: 99%

“…Note that the drift-diffusion model [4,17] and Eq. (1) [12,[31][32][33][34][35] provides an additional spin sink that can increase α and degrade Tint for the HM/FM interface. However, we find that the giant eff, ↑↓ values are not due primarily to SML.…”

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confidence: 99%

Effective Spin-Mixing Conductance of Heavy-Metal–Ferromagnet Interfaces

2019

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The effective spin-mixing conductance ( eff ↑↓ ) of a heavy metal/ferromagnet (HM/FM) interface characterizes the efficiency of the interfacial spin transport. Accurately determining eff ↑↓ is critical to the quantitative understanding of measurements of direct and inverse spin Hall effects. 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 eff ↑↓ and hence considerable underestimation of both the spin Hall ratio and the spin Hall conductivity in inverse/direct spin Hall experiments.

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“…20,[28][29][30] Recent studies suggesting that measurements of the SHA may actually be dominated by interface effects 20,28,31,32 are stimulating attempts to tailor these. [33][34][35][36][37] This makes it crucial to have a way to independently determine interface parameters. We recently described a formalism to evaluate local charge and spin currents 8 from the solutions of fully relativistic quantum mechanical scattering calculations 38 that include temperatureinduced lattice and spin disorder.…”

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Disorder Dependence of Interface Spin Memory Loss

et al. 2020

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The discontinuity of a spin-current through an interface caused by spin-orbit coupling is characterized by the spin memory loss (SML) parameter δ. We use first-principles scattering theory and a recently developed local current scheme to study the SML for Au|Pt, Au|Pd, Py|Pt and Co|Pt interfaces. We find a minimal temperature dependence for nonmagnetic interfaces and a strong dependence for interfaces involving ferromagnets that we attribute to the spin disorder. The SML is larger for Co|Pt than for Py|Pt because the interface is more abrupt. Lattice mismatch and interface alloying strongly enhance the SML that is larger for a Au|Pt than for a Au|Pd interface. The effect of the proximity induced magnetization of Pt is negligible. arXiv:2001.11520v1 [cond-mat.mes-hall] 30 Jan 2020

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Enhancement of spin transparency by interfacial alloying

Cited by 69 publications

References 37 publications

Origin of Strong Two-Magnon Scattering in Heavy-Metal/Ferromagnet/Oxide Heterostructures

Origin of Strong Two-Magnon Scattering in Heavy-Metal/Ferromagnet/Oxide Heterostructures

Effective Spin-Mixing Conductance of Heavy-Metal–Ferromagnet Interfaces

Disorder Dependence of Interface Spin Memory Loss

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