Keywords :
density functional theory; electron-phonon coupling; ferromagnets; transport phenomena; Ab initio calculations; Boltzmann; Density-functional-theory; Electron phonon couplings; Ferromagnets; First principles; Thermoelectric properties; Transport phenomenon; Transport theory; Variational approaches; Physics and Astronomy (all); General Physics and Astronomy
Abstract :
[en] Crossed magneto-thermo-electric coefficients are central to novel sensors and spin(calori)tronic devices. Within the framework of Boltzmann’s transport theory, we calculate the resistivity and Seebeck coefficients of the most common 3d ferromagnetic metals: Fe, Co, and Ni. We use a fully first-principles variational approach, explicitly taking electron-phonon scattering into account. The electronic band structures, phonon dispersion curves, phonon linewidths, and transport spectral functions are reported, comparing with experimental data. Successive levels of approximation are discussed: constant relaxation time approximation, scattering for a non-magnetic configuration, then spin polarized calculations with and without spin-orbit coupling (enabling spin-flips). Spin polarization and explicit electron-phonon coupling are found to be necessary to reach a correct qualitative picture: the effect of spin flipping is substantial for resistivity and very delicate for the Seebeck coefficient. The spin-dependent Seebeck effect is also predicted.
Funding text :
This work is supported by the National Natural Science Foundation of China under Grant No. 12074277, Natural Science Foundation of Jiangsu Province (BK20201404), the startup fund from Soochow University and the support from Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions. MJV acknowledges funding by the Belgian FNRS (PdR Grant No. T.0103.19—ALPS), ARC project DREAMS (G.A. 21/25-11) funded by Federation Wallonie Bruxelles and ULiege, and the CONNECT Excellence of Science Project Number 40007563 funded by FWO and FNRS. MDG acknowledges Klanik SA.
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