Spin-flip diffusion length in 5d transition metal elements: a first-principles benchmark

Little is known about the spin-flip diffusion length $l_{\rm sf}$, one of the most important material parameters in the field of spintronics. We use a density-functional-theory based scattering approach to determine values of $l_{\rm sf}$ that result from electron-phonon scattering as a function...

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Veröffentlicht in:	arXiv.org 2021-04
Hauptverfasser:	Nair, Rohit S, Barati, Ehsan, Gupta, Kriti, Yuan, Zhe, Kelly, Paul J
Format:	Artikel
Sprache:	eng
Schlagworte:	Atomic properties Diffusion length First principles Hall effect Local current Physics - Mesoscale and Nanoscale Physics Scattering Spintronics Transition metals
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description	Little is known about the spin-flip diffusion length $l_{\rm sf}$, one of the most important material parameters in the field of spintronics. We use a density-functional-theory based scattering approach to determine values of $l_{\rm sf}$ that result from electron-phonon scattering as a function of temperature for all 5d transition metal elements. $l_{\rm sf}$ does not decrease monotonically with the atomic number Z but is found to be inversely proportional to the density of states at the Fermi level. By using the same local current methodology to calculate the spin Hall angle $\Theta_{\rm sH}$ that characterizes the efficiency of the spin Hall effect, we show that the products $\rho(T)l_{\rm sf}(T)$ and $\Theta_{\rm sH}(T)l_{\rm sf}(T)$ are constant.
doi_str_mv	10.48550/arxiv.2104.09594
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subjects	Atomic properties Diffusion length First principles Hall effect Local current Physics - Mesoscale and Nanoscale Physics Scattering Spintronics Transition metals
title	Spin-flip diffusion length in 5d transition metal elements: a first-principles benchmark
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