Spin Hall Effects Due to Phonon Skew Scattering

Gorini, Cosimo; Eckern, Ulrich; Raimondi, Roberto

doi:10.1103/physrevlett.115.076602

Cited by 33 publications

(38 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…While the observed non-monotonic behavior is unexpected and cannot be explained following the established phenomenological analysis [23,24], it is compatible with the temperature scaling derived from the microscopic theory [22]. The importance of "ultra-clean" Fig.…”

supporting

confidence: 69%

Evidence for phonon skew scattering in the spin Hall effect of platinum

et al. 2018

View full text Add to dashboard Cite

We measure and analyze the effective spin Hall angle of platinum in the low residual resistivity regime by second harmonic measurements of the spin-orbit torques for a multilayer of Pt|Co|AlOx. An angular dependent study of the torques allows us to extract the effective spin Hall angle responsible for the damping-like torque in the system. We observe a strikingly non-monotonic and reproducible temperature dependence of the torques. This behavior is compatible with recent theoretical predictions which include both intrinsic and extrinsic (impurities and phonons) contributions to the spin Hall effect at finite temperature.

show abstract

supporting

confidence: 69%

Evidence for phonon skew scattering in the spin Hall effect of platinum

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Fig. 3(a) shows that Θ B increases linearly with increasing temperature, suggesting the dominant role of the phonon skew scattering mechanism [19,41]. The interfacial contribution is typically of much larger magnitude than the bulk value and its temperature dependence is opposite to the bulk term, namely instead of decreasing, it increases at lower temperature.…”

Section: A Magnetization Parallel To the Transport Direction (M ẑ)mentioning

confidence: 96%

Interfacial spin Hall effect and spin swapping in Fe-Au bilayers from first principles

2019

View full text Add to dashboard Cite

The interfaces in hybridized structures could give rise to rich phenomena, which open the way to novel devices with extraordinary performance. Here, we investigate the interface-related spin transport properties in Fe|Au bilayer based on first-principle calculation. We find that the spin Hall current in the Au side near the interface flows in the opposite direction to the bulk spin Hall current with the magnitude sensitive to the magnetization direction of Fe. This negative interfacial contribution is attributed to the spin dependent transmission within a few atomic layers, where a strong interfacial Rashba spin-orbit coupling exists. Surprisingly, the interfacial spin Hall currents are found to be not confined at the interface but extend tens of nanometers at low temperature, which is limited by momentum scattering and therefore much shorter than the spin diffusion length. In addition, the interfacial swapping spin currents, as a consequence of the spin precession under the interfacial Rashba field, are also obtained from our calculation and complete the full spin transport picture with all non-vanishing components. Our results suggest the importance of the interface engineering in spin-related transport in ferromagnetic|non-magnetic heterostructures and the possibility of manipulating the interfacial transport by the magnetization orientation of the magnetic layer.

show abstract

“…We assume that the system has sharp boundaries at y = ±W /2, and consider a particular case in which the injected spin current is polarized in the x-direction, j a 0 = δ ax j x 0 in Eq. (45). In order to find the redistribution of the electrochemical potential, we need solve the charge continuity equation, ∂ k j k = 0, with j k of Eq.…”

Section: Local Charge Currents Due To the Spin-galvanic Effect Inmentioning

confidence: 99%

“…At the boundary between the two regions, x = 0, we impose the continuity of the spin currents and spin densities, and at x = −L the condition Eq. (45). When the injected current j a 0 is polarized in a = x or a = z directions, Sec.…”

mentioning

confidence: 99%

Nonlocal magnetolectric effects in diffusive conductors with spatially inhomogeneous spin-orbit coupling

et al. 2019

View full text Add to dashboard Cite

We present a theoretical study of non-local magnetoelectric effects in diffusive hybrid structures with an intrinsic linear-in-momentum spin-orbit coupling (SOC) which is assumed to be spatially inhomogeneous. Our analysis is based on the SU(2)-covariant drift-diffusion equations from which we derive the BC at hybrid interfaces. Within this formulation, the spin current is covariantly conserved when the spin relaxation is only due to the intrinsic SOC. This conservation leads to the absence of spin Hall (SH) currents in homogeneous systems. We also consider extrinsic sources of relaxation (ESR), as magnetic impurities, which break the covariant spin conservation, and may lead to SH currents. We apply our model to describe non-local transport in a system with an interface separating two regions: one normal region without intrinsic SOC and one with a Rashba SOC. We first explore the inverse spin-galvanic effect, i.e., a spin polarization induced by an electric field. We demonstrate how the spatial behavior of such spin density depends on both, the direction of the electric field and the strength of the ESR rate. We also study the spin-to-charge conversion, and compute the charge current and the distribution of electrochemical potential in the Rashba region induced by a spin current injected into the normal region. In systems with an inhomogeneous SOC varying in one spatial direction, we find an interesting non-local reciprocity between the spin density induced by a charge current at a given point in space, and the spatially integrated current induced by a spin density injected at the same point. :1907.11688v1 [cond-mat.mes-hall] arXiv

show abstract

Spin Hall Effects Due to Phonon Skew Scattering

Cited by 33 publications

References 47 publications

Evidence for phonon skew scattering in the spin Hall effect of platinum

Evidence for phonon skew scattering in the spin Hall effect of platinum

Interfacial spin Hall effect and spin swapping in Fe-Au bilayers from first principles

Nonlocal magnetolectric effects in diffusive conductors with spatially inhomogeneous spin-orbit coupling

Contact Info

Product

Resources

About