Mechanisms of energy-efficient magnetization switching in a bistable nanowire
https://doi.org/10.17586/2220-8054-2020-11-3-294-300
Abstract
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.
Supporting agencies: The 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.
About the Authors
M.H.A. Badarneh
Science Institute, University of Iceland
Iceland
Iceland
107 Reykjav´ık
G. J. Kwiatkowsk
Science Institute, University of Iceland
Iceland
Iceland
107 Reykjav´ık
P. F. Bessarab
Science Institute, University of Iceland; ITMO University; Peter Grunberg Institute and Institute for Advanced Simulation
Russian Federation
Russian Federation
107 Reykjav´ık
197101 St. Petersburg, Russia
Forschungszentrum Julich, 52425 Julich, Germany
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Review
For citations:
Badarneh M., Kwiatkowsk G.J., Bessarab P.F. Mechanisms of energy-efficient magnetization switching in a bistable nanowire. Nanosystems: Physics, Chemistry, Mathematics. 2020;11(3):294–300. https://doi.org/10.17586/2220-8054-2020-11-3-294-300
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