Generation of Spin Current from Lattice Distortion Dynamics: Spin–Orbit Routes

Funato, Takumi; Kohno, Hiroshi

doi:10.7566/jpsj.87.073706

Cited by 12 publications

(3 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2 is the only form of spin current that can account for these results. Note that the linear dependence of  V xx 4φ with f SAW allows us to exclude contributions from spin-dependent inertial force (30) and related effects in the presence of SOI (31), which are proportional to higher order of f SAW .…”

Section: Model Descriptionmentioning

confidence: 99%

Acoustic spin Hall effect in strong spin-orbit metals

et al. 2021

Self Cite

View full text Add to dashboard Cite

We report on the observation of the acoustic spin Hall effect that facilitates lattice motion–induced spin current via spin-orbit interaction (SOI). Under excitation of surface acoustic wave (SAW), we find that a spin current flows orthogonal to the SAW propagation in nonmagnetic metals (NMs). The acoustic spin Hall effect manifests itself in a field-dependent acoustic voltage in NM/ferromagnetic metal bilayers. The acoustic voltage takes a maximum when the NM layer thickness is close to its spin diffusion length, vanishes for NM layers with weak SOI, and increases linearly with the SAW frequency. To account for these results, we find that the spin current must scale with the SOI and the time derivative of the lattice displacement. These results, which imply the strong coupling of electron spins with rotating lattices via the SOI, show the potential of lattice dynamics to supply spin current in strong spin-orbit metals.

show abstract

Section: Model Descriptionmentioning

confidence: 99%

Acoustic spin Hall effect in strong spin-orbit metals

et al. 2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…Furthermore, SVC is utilized in the angular momentum conversion between electron spin and vorticity of a surface acoustic wave (SAW) (i.e., an acoustic wave transmitted along the plane surface of a material). In this mechanism, local lattice rotation associated with a SAW drives spin currents via SVC [9,[12][13][14][15][16][17][18][19][20][21][22]. Along with research on conventional SAW-driven magnetization physics [23][24][25][26][27][28][29][30], these studies form a major field of SAW spintronics.…”

Section: Introductionmentioning

confidence: 99%

Spin hydrodynamic generation in unsteady flows

Funato¹,

Matsuo²

2022

Preprint

View full text Add to dashboard Cite

We theoretically investigate a spin-mediated conversion from fluid dynamics to voltage, known as spin hydrodynamic generation (SHDG), in oscillatory and transient unsteady flows. We consider unsteady flows of liquid metal between two parallel infinite planes and then calculate its vorticity fields based on the Navier-Stokes equation for an incompressible viscous fluid. The spin accumulation and spin current generated by unsteady flows are derived using a spin-diffusion equation, including spin-vorticity coupling, which is a couple of angular momentum between electron spin and vorticity field in unsteady flows. The estimation of SHDG in liquid mercury flow suggests that an observable magnitude of voltage can be induced in unsteady flows. Our results are expected to enable the realization of high-speed spin devices with unsteady flows and broaden the range of fluid spintronics applicability.

show abstract

“…They found characteristic magnetic dependence, which was not seen when using weak SOI metal instead of heavy metal , indicating mechanical spin-current generation via intrinsic SOI. Moreover, a previous work theoretically studied a spin current driven by lattice distortion dynamics via extrinsic SOI, and presented two mechanisms: one via the SHE from the charge current and the other via the diffusion of the spin accumulation [24]. It has also been suggested that spin current generation via extrinsic SOI is comparable with that via SVC in strong SOI systems.…”

mentioning

confidence: 99%

Helicity current generation by distorted Rashba coupling

Funato,

Matsuo

2021

Preprint

Self Cite

View full text Add to dashboard Cite

We theoretically study spin transport in two-or three-dimensional Rashba systems dynamically distorted by surface acoustic waves. The spin currents in the linear response to lattice distortion dynamics are calculated on the basis of a microscopic theory combined with local coordinate transformations. As a result, we find a mechanism of direct spin-current generation from lattice distortion not associated with a charge current or spin accumulation. Moreover, the in-plane helicity currents are generated by shear surface acoustic waves via the present mechanism. The generated helicity currents are not parallel to the vorticity of the lattice, and cannot be created with the conventional methods. Thus, our findings offer an alternative functionality of the conventional Rashba systems in the field of spintronics.

show abstract

Generation of Spin Current from Lattice Distortion Dynamics: Spin–Orbit Routes

Cited by 12 publications

References 32 publications

Acoustic spin Hall effect in strong spin-orbit metals

Acoustic spin Hall effect in strong spin-orbit metals

Spin hydrodynamic generation in unsteady flows

Helicity current generation by distorted Rashba coupling

Contact Info

Product

Resources

About