Regensburg 2022 – scientific programme
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MA: Fachverband Magnetismus
MA 15: Computational Magnetism 2
MA 15.5: Talk
Tuesday, September 6, 2022, 10:30–10:45, H48
Energy-efficient control of magnetization reversal in nanoparticles — •Mohamamd Badarneh1, Grzegorz Kwiatkowski1, and Pavel Bessarab1,2 — 1Science Institute of the University of Iceland, 107 Reykjavik, Iceland — 2Department of Physics and Electrical Engineering, Linnaeus University, Kalmar, Sweden
Control of magnetization switching is of critical importance for the development of novel technologies based on magnetic materials. Here we identify by means of optimal control theory energy-efficient protocols for magnetization switching in nanoparticles with uniaxial and biaxial anisotropy [1]. Optimal control paths minimizing the energy cost of magnetization reversal are calculated as functions of the switching time and materials properties, and used to derive energy-efficient switching pulses of external magnetic field. Hard-axis anisotropy reduces the minimum energy cost of magnetization switching due to activation of the internal torque in the desired switching direction. Analytical estimates quantifying this effect are obtained based on the perturbation theory. The optimal switching time providing a tradeoff between fast switching and energy efficiency is obtained. The energy cost of switching and the energy barrier between the stable states can be tuned independently in a biaxial nanomagnet. This provides a solution for the dilemma between energy-efficient writability and good thermal stability of magnetic memory elements. This work was funded by the Icelandic Research Fund (Grant No. 217813-052).
[1] G.J. Kwiatkowski et al., Phys. Rev. Lett. 126, 177206 (2021).