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Article overview
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Optimal control of magnetization reversal in a monodomain particle by means of applied magnetic field | | G. J. Kwiatkowski
; M. H.A. Badarneh
; D. V. Berkov
; P. F. Bessarab
; | | Date: |
5 Apr 2020 | | Abstract: | A complete analytical solution to the optimal reversal of a macrospin with
easy-axis anisotropy is presented. Optimal control path (OCP) minimizing the
energy cost of the reversal is identified as a function of the switching time,
anisotropy strength and damping parameter. Time-dependent direction and
amplitude of the optimal switching field are derived directly from the
calculated OCP. The minimum energy cost of the reversal as a function of the
switching time is characterized by two asymptotic regimes. It scales inversely
with the switching time for fast switching, follows an exponential asymptotics
for slow switching and reaches the lower limit proportional to the energy
barrier between the target states and to the damping parameter at infinitely
long switching time. For a given switching time, the energy cost of the
reversal can never be smaller than that for a free macrospin. This limitation
can be bypassed by adding a hard anisotropy axis which activates internal
torques in the desired switching direction, thereby significantly reducing the
energy cost. | | Source: | arXiv, 2004.2146 | | Services: | Forum | Review | PDF | Favorites | |
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