Local control of ultrafast dynamics in magnetic nanoparticles
A. Sukhov (1, 2), J. Berakdar (2) ((1) Max-Planck-Institut fuer, Mikrostrukturphysik, Weinberg 2, Halle/Saale, Germany, (2) Institut fuer, Physik, Martin-Luther-Universitaet Halle-Wittenberg, Heinrich-Damerow-Str. 4,, Halle/Saale, Germany)
TL;DR
This paper develops a local control method to precisely steer the magnetization of magnetic nanoparticles using tailored magnetic field pulses, enabling rapid switching or freezing within a few precessional periods, confirmed by numerical simulations.
Contribution
The authors derive analytical expressions for magnetic field pulses that control nanoparticle magnetization, demonstrating fast switching capabilities.
Findings
Magnetization switching achieved within few precessional periods.
Analytical control pulses successfully steer magnetization states.
Numerical simulations confirm the effectiveness of the control scheme.
Abstract
Using the local control theory we derive analytical expressions for magnetic field pulses that steer the magnetization of a monodomain magnetic nanoparticle to a predefined state. Finite-temperature full numerical simulations confirm the analytical results and show that a magnetization switching or freezing is achievable within few precessional periods and that the scheme is exploitable for fast thermal switching.
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