Dynamic switching of magnetization in driven magnetic molecules

TL;DR

This paper investigates how magnetic molecules can have their magnetization switched dynamically by applying static and variable magnetic fields, revealing sensitive phase space behavior near a separatrix.

Contribution

It introduces a semiclassical analysis of magnetization dynamics in molecular magnets, highlighting the role of the separatrix in magnetization switching.

Findings

Phase space contains a separatrix line.

Solutions far from the separatrix are oscillatory.

States near the separatrix are highly sensitive to perturbations.

Abstract

We study the magnetization dynamics of a molecular magnet driven by static and variable magnetic fields within a semiclassical treatment. The underling analyzes is valid in a regime, when the energy is definitely lower than the anisotropy barrier, but still a substantial number of states are excited. We find the phase space to contain a separatrix line. Solutions far from it are oscillatory whereas the separatrix solution is of a soliton type. States near the separatrix are extremely sensitive to small perturbations, a fact which we utilize for dynamically induced magnetization switching.