Large spin Hall effect in an amorphous binary alloy

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 ang...

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Bibliographic Details
Published in:Physical review. B 2018-09, Vol.98 (9), p.094433, Article 094433
Main Authors: Fritz, Katharina, Wimmer, Sebastian, Ebert, Hubert, Meinert, Markus
Format: Article
Language:English
Subjects:
Alloy systems
Amorphous alloys
Binary alloys
Binary systems
Electromagnetism
First principles
Hall effect
Metallic glasses
Phase transitions
Solid solutions
Thin films
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Summary: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 θSH=−0.20 is obtained for amorphous W0.7Hf0.3. 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.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.98.094433