Year: 2018
Type: article
Abstract: We investigate the spin Hall effect of W-Hf thin films, which exhibit a phase transition from a segregated phase mixture to an amorphous alloy below 70% W. The spin Hall angle was determined with a planar harmonic Hall voltage technique. Due to the accompanying jump in resistivity, the spin Hall angle shows a pronounced maximum at the composition of the phase transition. The spin Hall conductivity does, however, reduce from W to Hf with a weak discontinuity across the phase transition. The maximum spin Hall angle of ${\ensuremath{\theta}}_{\mathrm{SH}}=\ensuremath{-}0.20$ is obtained for amorphous ${\mathrm{W}}_{0.7}{\mathrm{Hf}}_{0.3}$. A detailed comparison with spin Hall conductivities calculated from first principles for hcp, fcc, and bcc solid solutions provides valuable insight into the alloying physics of this binary system.
Institutions: Bielefeld University, Ludwig-Maximilians-Universität München
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funder: Deutsche Forschungsgemeinschaft
Award: G2886820969
OpenAlex ID: W2783404661