Year: 2025
Type: article
Abstract: We investigate the spin Hall conductivity (SHC) of a composition series of a Ta-Re bcc solid solution. At approximately 60 at.% Ta the Ta-Re alloy features a SHC similar to bcc-W, while both endpoints of the compositional series have rather moderate SHC. The intermediate stoichiometries exhibit a substantial enhancement due to Fermi-level tuning through the same band structure feature which gives bcc-W and β -W its large SHC. We provide experimental evidence for the enhancement of the SHC in the alloy via THz emission upon ultrafast laser excitation of Ta-Re/CoFeB bilayers. We demonstrate that a rigid-band model derived from bcc-W and Fermi-level tuning describes the experimental data with a similar accuracy as the coherent-potential approximation alloy calculations of the SHC.
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Awards: Extreme Optical Nonlinearities in 2D materials for Far-Infrared Photonics, G186843352, Magnetron CoSputtering System, G3802872888, G434337789, Untersuchung von NichtgleichgewichtsSpinLadungsTransportmechanismen für Hochleistungs und antennengekoppelte spintronische TerahertzBauelemente (HIGHSPINTERA), G6327420348, Integrierte GraphenaufChip Terahertz Technologie (INTEGRATECH), Variables HallMesssystem, Spintronische THzEmitter mit uniaxialer und unidirektionaler magnetischer Anisotropie für magnetfeldfreien Betrieb und elektrische THzPhasenUmschaltung
OpenAlex ID: W4410159288