Calculating spin transport properties from first principles: Spin currents

R.J.H. Wesselink, K. Gupta, Z. Yuan, P.J. Kelly (Corresponding Author)

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Abstract

Local charge and spin currents are evaluated from the solutions of fully relativistic quantum mechanical scattering calculations for systems that include temperature-induced lattice and spin disorder as well as intrinsic alloy disorder. This makes it possible to determine material-specific spin transport parameters at finite temperatures. Illustrations are given for a number of important materials and parameters at 300 K. The spin-flip diffusion length lsf of Pt is determined from the exponential decay of a spin current injected into a long length of thermally disordered Pt; we find lsfPt=5.3±0.4nm. For the ferromagnetic substitutional disordered alloy permalloy (Py), we inject currents that are fully polarized parallel and antiparallel to the magnetization and calculate lsf from the exponential decay of their difference; we find lsfPy=2.8±0.1nm. The transport polarization β is found from the asymptotic polarization of a charge current in a long length of Py to be β=0.75±0.01. The spin Hall angle ΘsH is determined from the transverse spin current induced by the passage of a longitudinal charge current in thermally disordered Pt; our best estimate is ΘsHPt=4.5±1% corresponding to the experimental room-temperature bulk resistivity ρ=10.8μΩcm.

Original languageEnglish
Article number144409
Number of pages19
JournalPhysical review B: Covering condensed matter and materials physics
Volume99
Issue number14
DOIs
Publication statusPublished - 11 Apr 2019

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Transport properties
transport properties
Polarization
Induced currents
Permalloys (trademark)
Temperature
Magnetization
Scattering
disorders
decay
polarization
diffusion length
magnetization
electrical resistivity
temperature
room temperature
estimates
scattering

Cite this

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abstract = "Local charge and spin currents are evaluated from the solutions of fully relativistic quantum mechanical scattering calculations for systems that include temperature-induced lattice and spin disorder as well as intrinsic alloy disorder. This makes it possible to determine material-specific spin transport parameters at finite temperatures. Illustrations are given for a number of important materials and parameters at 300 K. The spin-flip diffusion length lsf of Pt is determined from the exponential decay of a spin current injected into a long length of thermally disordered Pt; we find lsfPt=5.3±0.4nm. For the ferromagnetic substitutional disordered alloy permalloy (Py), we inject currents that are fully polarized parallel and antiparallel to the magnetization and calculate lsf from the exponential decay of their difference; we find lsfPy=2.8±0.1nm. The transport polarization β is found from the asymptotic polarization of a charge current in a long length of Py to be β=0.75±0.01. The spin Hall angle ΘsH is determined from the transverse spin current induced by the passage of a longitudinal charge current in thermally disordered Pt; our best estimate is ΘsHPt=4.5±1{\%} corresponding to the experimental room-temperature bulk resistivity ρ=10.8μΩcm.",
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Calculating spin transport properties from first principles : Spin currents. / Wesselink, R.J.H.; Gupta, K.; Yuan, Z.; Kelly, P.J. (Corresponding Author).

In: Physical review B: Covering condensed matter and materials physics, Vol. 99, No. 14, 144409, 11.04.2019.

Research output: Contribution to journalArticleAcademicpeer-review

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