najoNanosystems: Physics, Chemistry, MathematicsНаносистемы: физика, химия, математика2220-80542305-7971Университет ИТМО10.17586/2220-8054-2020-11-3-294-300najo-423Research ArticlePHYSICSФИЗИКАMechanisms of energy-efficient magnetization switching in a bistable nanowireBadarnehM.H.A.

107 Reykjav´ık

KwiatkowskG. J.

107 Reykjav´ık

BessarabP. F.

107 Reykjav´ık

197101 St. Petersburg, Russia

Forschungszentrum Julich, 52425 Julich, Germany

bessarab@hi.isScience Institute, University of IcelandIcelandScience Institute, University of Iceland; ITMO University; Peter Grunberg Institute and Institute for Advanced SimulationRussian Federation202030072025113294–300Copyright © Badarneh M., Kwiatkowsk G.J., Bessarab P.F., 20252025Badarneh M., Kwiatkowsk G.J., Bessarab P.F.Badarneh M., Kwiatkowsk G.J., Bessarab P.F.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://nanojournal.ifmo.ru/jour/article/view/423

Theoretical calculations of optimal control paths minimizing the energy cost of the magnetization reversal in 1D magnetic nanowires are presented. The energy-efficient reversal mechanism is studied as a function of the nanowire length and Gilbert damping parameter. For short nanowires, the optimal reversal mechanism corresponds to a uniform rotation of magnetization. If the length of the wire exceeds a certain critical length defined by the material parameters, switching time and damping, a standing spin wave emerges during magnetization switching. Comparison between the calculated optimal control paths and minimum energy paths reveals that realization of high energy efficiency of switching does not necessarily translate to the minimization of the energy barrier between the target magnetic states.

magnetic nanowiremagnetization switchingoptimal controlThe authors would like to thank T. Sigurjonsd´ ottir for helpful discussions. This work was funded by the Rus-´ sian Science Foundation (Grant No. 19-72-10138), the Icelandic Research Fund (Grant No. 184949-052), and the Alexander von Humboldt Foundation.ReferencesStano M., Fruchart O. Magnetic nanowires and nanotubes. Inˇ Handbook of Magnetic Materials, vol. 27, ed. Bruck E. Elsevier, Amsterdam.,¨ 2018, P. 155–267.Stano M., Fruchart O. Magnetic nanowires and nanotubes. Inˇ Handbook of Magnetic Materials, vol. 27, ed. Bruck E. Elsevier, Amsterdam.,¨ 2018, P. 155–267.Parkin S.S.P., Hayashi M. Thomas L. Magnetic domain-wall racetrack memory. Science, 2008, 320(5873), P. 190–194.Parkin S.S.P., Hayashi M. Thomas L. Magnetic domain-wall racetrack memory. Science, 2008, 320(5873), P. 190–194.Hinzke D., Nowak U. Magnetization switching in nanowires: Monte Carlo study with fast Fourier transformation for dipolar fields. 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The authors declare that there are no conflicts of interest present.