Exact Activation Energy of Magnetic Single Domain Particles

TL;DR

This paper derives an exact analytical formula for the activation energy of single-domain magnetic particles with uniaxial anisotropy under external magnetic fields, and studies its behavior near switching boundaries.

Contribution

It provides the first exact expression for activation energy in this context and analyzes its scaling near critical points.

Findings

Exact analytical expression for activation energy derived

Scaling behavior near switching boundary characterized

Insights into magnetic switching mechanisms obtained

Abstract

I present the exact analytical expression for the activation energy as a function of externally applied magnetic fields for a single--domain magnetic particle with uniaxial anisotropy (Stoner--Wohlfahrt model), and investigate the scaling behavior of the activation energy close to the switching boundary.