Spin-transfer and spin-orbit torques in the Landau-Lifshitz-Gilbert equation.

Autor:	Meo A; Department of Physics, University of York, York YO10 5DD, United Kingdom.; Department of Physics, Mahasarakham University, Mahasarakham 44150, Thailand., Cronshaw CE; Department of Physics, University of York, York YO10 5DD, United Kingdom., Jenkins S; Department of Physics, University of York, York YO10 5DD, United Kingdom.; TWIST Group, Institut für Physik Johannes Gutenberg-Universität, Mainz 55128, Germany., Lees A; BT Applied Research, Adastral Park Martlesham, Suffolk IP5 3RE, United Kingdom., Evans RFL; Department of Physics, University of York, York YO10 5DD, United Kingdom.
Jazyk:	angličtina
Zdroj:	Journal of physics. Condensed matter : an Institute of Physics journal [J Phys Condens Matter] 2022 Nov 14; Vol. 51 (2). Date of Electronic Publication: 2022 Nov 14.
DOI:	10.1088/1361-648X/ac9c80
Abstrakt:	Dynamic simulations of spin-transfer and spin-orbit torques are increasingly important for a wide range of spintronic devices including magnetic random access memory, spin-torque nano-oscillators and electrical switching of antiferromagnets. Here we present a computationally efficient method for the implementation of spin-transfer and spin-orbit torques within the Landau-Lifshitz-Gilbert equation used in micromagnetic and atomistic simulations. We consolidate and simplify the varying terminology of different kinds of torques into a physical action and physical origin that clearly shows the common action of spin torques while separating their different physical origins. Our formalism introduces the spin torque as an effective magnetic field, greatly simplifying the numerical implementation and aiding the interpretation of results. The strength of the effective spin torque field unifies the action of the spin torque and subsumes the details of experimental effects such as interface resistance and spin Hall angle into a simple transferable number between numerical simulations. We present a series of numerical tests demonstrating the mechanics of generalised spin torques in a range of spintronic devices. This revised approach to modelling spin-torque effects in numerical simulations enables faster simulations and a more direct way of interpreting the results, and thus it is also suitable to be used in direct comparisons with experimental measurements or in a modelling tool that takes experimental values as input. (Creative Commons Attribution license.)
Databáze:	MEDLINE
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