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
- Cornell Univ., Ithaca, NY (United States); Cornell University
- Cornell Univ., Ithaca, NY (United States)
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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