Reversal Time of Jump-Noise Dynamics for Large Nucleation

TL;DR

This paper investigates the reversal time of jump-noise dynamics in nanomagnets during large nucleation, revealing its dependence on energy barriers and its potential role in magnetoelectric switching.

Contribution

It characterizes the reversal time in the large nucleation regime of jump-noise dynamics using simulations and analysis, linking it to energy landscape properties.

Findings

Reversal time asymptotically equals the time of a single jump event.

Reversal time depends linearly on the energy barrier height.

Large nucleation regime may explain magnetoelectric switching phenomena.

Abstract

The jump-noise is a phenomenological stochastic process used to model the thermal fluctuation of magnetization in nanomagnets. In this work, the large nucleation regime of jump-noise dynamics is studied, and its reversal time is characterized from Monte Carlo simulations and analysis. Results show that the reversal time of jump-noise dynamics for large nucleation is asymptotically equal to the time constant associated with a single jump-noise scattering event from the energy minimum in the energy landscape of the magnetization. The reversal time for large nucleation depends linearly on the height of the energy barrier for large barriers. The significance of the large nucleation regime of jump-noise dynamics to phenomenologically explain the magnetoelectric switching of antiferromagnetic order parameter is also prospected.