Regensburg 2025 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 40: Spin Transport and Orbitronics, Spin-Hall Effects II (joint session MA/TT)
TT 40.4: Vortrag
Mittwoch, 19. März 2025, 18:15–18:30, H19
Finite-temperature transport properties of magnetic/non-magnetic alloys: trends in the longitudinal and in the transverse charge and spin currents — •Alberto Marmodoro1, Yang Wang2, Yuqing Lin3, and Ilja Turek4 — 1Institute of Physics (FZU), Czech Academy of Sciences, Prague, Czech Republic — 2Pittsburgh Supercomputer Center (PSC), Carnegie Mellon University, Pittsburgh, USA — 3Mellon College of Science, Carnegie Mellon University, Pittsburgh, USA — 4Institute of Physics of Materials, Czech Academy of Sciences, Brno, Czech Republic
Alloys composed of magnetic and non-magnetic metals exhibit non-trivial transport trends as a function of composition and temperature. The stoichiometry controls not only the Curie point, but also the slope of resistivity vs. temperature. Beside affecting longitudinal currents, this has further implications also for transverse charge and spin currents, i.e. on anomalous Hall effects [1]. We report first-principles results based on density functional theory (DFT), relativistic linear response and Green function methods based on the multiple scattering Korringa-Kohn-Rostoker (KKR) or linear muffin tin orbitals (LMTO) frameworks.
[1] "Large anomalous Hall angle in the Fe(60),Al(40) alloy induced by substitutional atomic disorder" by J.Kudrnovsky et al. PRB 101, 054437 (2020); "Exploiting Spin Fluctuations for Enhanced Pure Spin Current" by P.Wu et al. PRL 128, 227203 (2022); "Critical enhancement of the spin Hall effect by spin fluctuations" by S.Okamoto et al. Quantum Materials 29, 9 (2024).
Keywords: transport; anomalous Hall effect; finite temperature; alloys