Magnetic field relaxation in ferromagnetic Ising systems

TL;DR

This paper investigates thermal magnetization reversal in ferromagnetic Ising systems through experiments and simulations, revealing Gaussian relaxation time distributions and a strong field regime, aligning with existing data and exploring new parameter spaces.

Contribution

It provides a combined experimental and simulation analysis of magnetization reversal, including novel insights into relaxation time distributions and field regimes in ferromagnetic Ising systems.

Findings

Simulated behavior matches experimental data on switching times and fields.

Relaxation time distribution is Gaussian in the studied parameter space.

Identifies a strong field regime not previously characterized.

Abstract

We analyze the thermal magnetization reversal processes in magnetic grains. Two experiments are carried out: swtiching time and switching field experiments. In both cases, we find that the simulated behavior is coherent with existing experimental data (the streched exponent of the switching time experiment increases with the temperature and is superior to unity; there exists a master curve for the switching field experiment). Moreover, we simulated magnetic grains in a region of parameters where no experimental data are available. We find that the relaxation time distribution $P(\ln{\tau})$ is gaussian, and we find the existence of a strong field regime.