Year: 2025
Type: article
Abstract: In this study, a square Wheatstone bridge geometry is proposed to measure the field-like spin–orbit torque (FL-SOT) via second harmonic anisotropic magnetoresistance measurements. This design yields an enhanced signal over the conventional Hall bar due to a geometric enhancement. In addition, the square Wheatstone bridge allows for in situ calibration without the need for additional patterns. The FL-SOT coefficient is extracted from the square Wheatstone bridge patterned on a Py(=Fe80Ni20)/Pt bilayer. This extrapolated torque is then compared against an elongated Wheatstone bridge and a Hall bar to demonstrate efficacy in studying the field-like torque.
Source: Journal of Applied Physics
DOI: 10.1063/5.0300521
Authors: Kyle J. Peterson, David M. Plehn, Xin Fan
Institution: University of Denver
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,500
Funder: National Science Foundation
OpenAlex ID: W4415870360