Distributions of switching times of single-domain particles using a time quantified Monte Carlo method

TL;DR

This study uses a time quantified Monte Carlo method to simulate and analyze the switching time distribution of single-domain particles, revealing dual relaxation times and resonance effects under various conditions.

Contribution

It introduces a novel Monte Carlo simulation approach for accurately modeling switching time distributions in magnetic particles, aligning well with analytical solutions.

Findings

Switching time distribution can be described by two relaxation times.

Good agreement with Fokker-Planck analytical solutions in low barrier limit.

Resonance effects and multiple peaks observed in distribution curves with small damping.

Abstract

Using a time quantified Monte Carlo scheme we performed simulations of the switching time distribution of single mono-domain particles in the Stoner-Wohlfarth approximation. We considered uniaxial anisotropy and different conditions for the external applied field. The results obtained show the switching time distribution can be well described by two relaxation times, either when the applied field is parallel to the easy axis or for an oblique external field and a larger damping constant. We found that in the low barrier limit these relaxation times are in very good agreement with analytical results obtained from solutions of the Fokker-Planck equation related to this problem. When the damping is small and the applied field is oblique the shape of the distribution curves shows several peaks and resonance effects.