SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 107: Poster Session VIII: Poster to Mini-Symposium: Manipulation and control of spins on functional surfaces IV
O 107.5: Poster
Donnerstag, 4. März 2021, 13:30–15:30, P
Power optimization for spin-orbit torque induced magnetization switching in a monodomain magnetic particle — •Sergei Vlasov1, Igor Lobanov1, Grzegorz Kwiatkowski2, Valery Uzdin1, and Pavel F. Bessarab1, 2 — 1ITMO University, St. Petersburg, Russia — 2University of Iceland, Reykjavik, Iceland
The discovery of the spin-orbit torque (SOT) has opened a wide range of opportunities for the efficient manipulation of the magnetization, which is advantageous for spintronics applications. In particular, SOT produced by an in-plane current in a heavy-metal layer can be used to induce magnetization switching in a supported ferromagnetic element, thus providing means for bit operations in nonvolatile magnetic memories.
In this study, we demonstrate employing the optimal control theory that the energy cost of the SOT-induced magnetization switching can be reduced by properly tuning the current pulse. We present a complete analytical solution to the energy-efficient reversal of a macrospin under SOT. We calculate optimal control paths (OCPs) of the magnetization reversal and reconstruct the time-dependent amplitude and frequency of both components of the in-plane current. We also demonstrate the stability of calculated optimal switching protocols with respect to perturbations in materials properties and temperature.
This work was funded by the Russian Science Foundation (Grant No.19-72-10138) and the Icelandic Research Fund (Grant No. 184949-052).