Separation of Artifacts from Spin‐Torque Ferromagnetic Resonance Measurements of Spin‐Orbit Torque for the Low‐Symmetry Van der Waals Semi‐Metal ZrTe3
Abstract
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 = 0.014 ± 0.004, and an unconventional in‐plane field‐like torque efficiency = 0.003 ± 0.001. 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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Dec 17, 2021
- Source ID
- 10.1002/qute.202100111
Entities
People
- Daniel C. Ralph
- Joseph A. Mittelstaedt
- Saba Karimeddiny
- Thow Min Jerald Cham
- Vishakha Gupta
Organizations
- Air Force Office of Scientific Research
- Cornell University
- Defense Advanced Research Projects Agency
- National Science Foundation
- United States Department of Energy