Noise-induced effects in high-speed reversal of magnetic dipole

TL;DR

This paper uses computer simulations to study how noise affects the speed and reliability of magnetic dipole reversal, revealing optimal pulse durations and angles that significantly improve performance.

Contribution

It demonstrates the existence of an optimal pulse duration and angle that minimize reversal time and jitter, providing new insights into noise effects in magnetic switching.

Findings

Optimal pulse duration minimizes mean reversal time and jitter.

Reversal time can be reduced by up to 7 times for damping α=1.

Jitter can be decreased by 1 to 3 orders of magnitude.

Abstract

The effect of noise on the reversal of a magnetic dipole is investigated on the basis of computer simulation of the Landau-Lifshits equation. It is demonstrated that at the reversal by the pulse with sinusoidal shape, there exists the optimal duration, which minimizes the mean reversal time (MRT) and the standard deviation (jitter). Both the MRT and the jitter significantly depend on the angle between the reversal magnetic field and the anisotropy axis. At the optimal angle the MRT can be decreased by 7 times for damping $\alpha$=1 and up to 2 orders of magnitude for $\alpha$=0.01, and the jitter can be decreased from 1 to 3 orders of magnitude in comparison with the uniaxial symmetry case.