Multiple dynamic transitions in anisotropic Heisenberg ferromagnet driven by polarised magnetic field

TL;DR

This study uses Monte Carlo simulations to explore how a uniaxial anisotropic Heisenberg ferromagnet responds to a rotating elliptically polarized magnetic field, revealing three successive dynamic phase transitions as temperature decreases.

Contribution

It demonstrates the occurrence of multiple dynamic phase transitions in an anisotropic Heisenberg ferromagnet driven by a polarized magnetic field, confirmed through dynamic specific heat analysis.

Findings

Three dynamic phase transitions observed at different temperatures.

Dynamic specific heat exhibits three peaks corresponding to these transitions.

Transitions are more prominent in the low anisotropy limit.

Abstract

Uniaxially (Z-axis) anisotropic Heisenberg ferromagnet, in presence of time dependent (but uniform over space) magnetic field, is studied by Monte Carlo simulation. The time dependent magnetic field was taken as elliptically polarised where the resultant field vector rotates in X-Z plane. The system is cooled (in presence of the elliptically polarised magnetic field) from high temperature. As the temperature decreases, it was found that in the low anisotropy limit the system undergoes three successive dynamical phase transitions. These three dynamic transitions were confirmed by studying the temperature variation of dynamic 'specific heat'. The temperature variation of dynamic 'specific heat' shows three peaks indicating three dynamic transition points.