Nonequilibrium dynamical ferromagnetism of interacting Single-Molecule Magnets

TL;DR

This paper introduces a nonequilibrium Monte Carlo method to simulate the complex ferromagnetic behavior of interacting single-molecule magnets, successfully capturing quantum and thermal effects to match experimental results.

Contribution

The paper presents a novel simulation framework combining quantum tunneling and thermal activation for SMMs, providing accurate reproduction of experimental magnetization curves.

Findings

Quantum and classical effects both influence hysteresis behaviors.

The simulation method accurately reproduces experimental magnetization curves.

The approach offers deep insights into the dynamics of SMMs.

Abstract

We propose a nonequilibrium Monte Carlo (MC) approach to explore nonequilibrium dynamical ferromagnetism of interacting single molecule magnets (SMMs). Both quantum spin tunneling and thermally activated spin reversal are successfully implemented in the same MC simulation framework. Applied to a typical example, this simulation method satisfactorily reproduces experimental magnetization curves with experimental parameters. Our results show that both quantum and classical effects are essential to determine the hysteresis behaviors. This method is effective and reliable to gain deep insights into SMMs.