Regensburg 2022 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 15: Computational Magnetism 2

MA 15.5: Vortrag

Dienstag, 6. September 2022, 10:30–10:45, H48

Energy-efficient control of magnetization reversal in nanoparticles — •Mohamamd Badarneh¹, Grzegorz Kwiatkowski¹, and Pavel Bessarab^1,2 — 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).