Accurate extraction of anisotropic spin-orbit torques from harmonic measurements

D.M.J. van Elst, M. R.A. Peters, F. Büttner (Corresponding author), A. Wittmann, E.A. Tremsina, C.O. Avci, R. Lavrijsen, H.J.M. Swagten, G.S.D. Beach

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

Samenvatting

One of the most powerful ways to manipulate spins in nanometer-scale devices is by converting a charge current to a spin current via spin-orbit coupling. The resulting spin-orbit torques (SOTs) have been investigated and utilized extensively in the past decade. Quantitatively, however, SOTs may exhibit a non-trivial angular dependence, which is not well explored. Here, we develop a nested iterative analysis to determine the magnitude of SOTs from harmonic Hall measurements. This updated method largely improves the fit quality in the full magnetic field range and accurately retrieves even higher order, anisotropic spin-orbit torque coefficients. The numerical implementation of our algorithm is fast, robust, and designed for easy integration into existing analysis schemes. We verify our code using simulated data with and without anisotropic SOTs. Accurately quantifying higher order SOT terms can be especially useful for modeling non-uniform magnetic textures such as domain walls and skyrmions and current-induced magnetization switching characteristics.

Originele taal-2Engels
Artikelnummer172403
Aantal pagina's6
TijdschriftApplied Physics Letters
Volume118
Nummer van het tijdschrift17
DOI's
StatusGepubliceerd - 26 apr 2021

Bibliografische nota

Funding Information:
was supported in part by NSF award number ECCS-1808828 and by the DARPA TEE program.

Funding Information:
F.B. acknowledges financial support from the Helmholtz Young Investigator Group Program. A.W. acknowledges financial support from the Swiss National Science Foundation. This work

Publisher Copyright:
© 2021 Author(s).

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