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Separation of Artifacts from Spin–Torque Ferromagnetic Resonance Measurements of Spin–Orbit Torque for the Low–Symmetry Van der Waals Semi–Metal ZrTe3

Journal Article · · Advanced Quantum Technologies
Spin-orbit torques generated by exfoliated layers of the low-symmetry semi-metal ZrTe3 are measured using the spin-torque ferromagnetic resonance (ST-FMR) technique. When the ZrTe3 has a thickness greater than about 10 nm, artifacts due to spin pumping and/or resonant heating can cause the standard ST-FMR analysis to overestimate the true magnitude of the torque efficiency by as much as a factor of 30, and to indicate incorrectly that the spin-orbit torque depends strongly on the ZrTe3 layer thickness. Artifact-free measurements can still be achieved over a substantial thickness range by the method developed recently to detect ST-FMR signals in the Hall geometry as well as the longitudinal geometry. ZrTe3/Permalloy samples generate a conventional in-plane anti-damping spin torque efficiency ξ$$^{FL}_{∥}$$ = 0.014 ± 0.004, and an unconventional in-plane field-like torque efficiency |ξ$$^{FL}_{∥}$$| = 0.003 ± 0.001. As a result, the out-of-plane anti-damping torque is negligible. It is suggested that artifacts similarly interfere with the standard ST-FMR analysis for other van der Waals samples thicker than about 10 nm.
Research Organization:
Cornell Univ., Ithaca, NY (United States)
Sponsoring Organization:
AFOSR-MURI; Experimental Condensed Matter Physics; National Science Foundation (NSF); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
Grant/Contract Number:
SC0017671
OSTI ID:
1883556
Alternate ID(s):
OSTI ID: 1836327
Journal Information:
Advanced Quantum Technologies, Journal Name: Advanced Quantum Technologies Journal Issue: 2 Vol. 5; ISSN 2511-9044
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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