Stochastic heating of a molecular nanomagnet

TL;DR

This paper investigates how static and pulsed magnetic fields can induce stochastic heating in a molecular nanomagnet, leading to diffusive and irreversible magnetization deflections, with analytical and numerical analysis of the process.

Contribution

It provides an analytical framework for understanding stochastic heating in molecular nanomagnets and identifies field conditions that cause energy diffusion.

Findings

Analytical expression for the diffusion constant derived.

Identification of field parameters causing stochastic energy pumping.

Numerical validation of the analytical model.

Abstract

We study the excitation dynamics of a single molecular nanomagnet by static and pulsed magnetic fields. Based on a stability analysis of the classical magnetization dynamics we identify analytically the fields parameters for which the energy is stochastically pumped into the system in which case the magnetization undergoes diffusively and irreversibly a large angle deflection. An approximate analytical expression for the diffusion constant in terms of the fields parameters is given and assessed by full numerical calculations.