A15 Phase Ta3Sb Thin Films: Direct Synthesis and Giant Spin-Orbit Effects

We use co-sputtering to directly synthesize thin films of the A15 phase intermetallic compound Ta3Sb, which has been predicted to have a giant spin Hall conductivity. We identify a large window of Ta:Sb flux ratio that stabilizes single-phase A15 Ta3Sb. Composition analyses of these films show a Ta:...

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Bibliographic Details
Published inarXiv.org
Main Authors Jiang, J S, Du, Qianheng, Welp, Ulrich, Chapai, Ramakanta, Arava, Hanu, Liu, Yuzi, Li, Yue, Pearson, John, Bhattacharya, Anand, Park, Hyowon
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 06.08.2023
Subjects
A15 compounds
Bilayers
Charge materials
Ferromagnetism
Ferrous alloys
Intermetallic compounds
Magnetic alloys
Phase diagrams
Thickness
Thin films
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Summary:We use co-sputtering to directly synthesize thin films of the A15 phase intermetallic compound Ta3Sb, which has been predicted to have a giant spin Hall conductivity. We identify a large window of Ta:Sb flux ratio that stabilizes single-phase A15 Ta3Sb. Composition analyses of these films show a Ta:Sb atomic ratio of 4:1, which is consistent with the known Ta-Sb phase diagram. The spin Hall conductivity of thin film Ta3Sb is -3400+/-400 (hbar/2e) S/cm and the spin-orbit torque efficiency is -0.6+/-0.1 at 20 K, as determined from harmonic Hall measurements of Ta3Sb/permalloy bilayer structures. These giant values make Ta3Sb a promising material for efficient charge-to-spin conversion in spintronic applications. Large field-like spin-orbit effective fields that are independent of the ferromagnetic layer thickness have also been measured in the Ta3Sb/permalloy bilayers. We attribute the field-like spin-orbit effective field to the Rashba effect at the interface.
ISSN:2331-8422