2025/10/10 by Jyoti Yadav, Felix Janus, Yadav, Jyoti +9
Engineering · #High Entropy Alloys Studies #Metal and Thin Film Mechanics #High-Temperature Coating Behaviors
paper · pdf · doi:10.48550/arxiv.2510.09835
We study thin films of the high-entropy alloy system Alx(CrMoW)1-x, grown on Ta seed layers by magnetron co-sputtering. Between x=0.2 and x=0.6, a resistivity larger than 100μΩcm is achieved, with a peak of 180μΩcm at x=0.5. Around the stoichiometric composition AlCrMoW, the alloy forms a bcc solid solution. The harmonic Hall method was used to characterize the spin Hall angle of the alloy series, where a maximum spin Hall angle of θ= -0.12 ± 0.01 is observed for x=0.25. The implied spin Hall conductivity is σSH ≈ -72 000 ℏ/(2e) S/m. The experimental results show excellent agreement with density functional theory calculations, which show similar trends and values. The results demonstrate that high-entropy alloys with a main-group element component can form a simple crystal structure and show high resistivity. This suggests that a whole new class of materials for spin Hall device engineering is available with simple methods.