Rodlike Heisenberg nanomagnet driven by propagating magnetic field: Nonequilibrium phase transition

TL;DR

This study investigates the nonequilibrium phase transition in a rodlike anisotropic Heisenberg ferromagnet driven by a propagating magnetic field wave, revealing how the transition temperature depends on field amplitude and anisotropy.

Contribution

It provides the first detailed Monte Carlo simulation analysis of the dynamical phase transition in a rodlike Heisenberg ferromagnet under propagating magnetic fields.

Findings

Transition temperature decreases with increasing field amplitude.

Phase boundary is unaffected by wavelength of the propagating wave.

Stronger anisotropy enlarges the ordered phase region.

Abstract

The dynamical responses of a rodlike anisotropic Heisenberg ferromagnet, irradiated by the propagating magnetic field wave, have been studied by Monte Carlo simulation using Metropolis single spin-flip algorithm. A nonequilibrium dynamical phase transition has been observed. The transition temperature has been obtained from the peak position of the variance of the dynamic order parameter plotted as a function of the temperature. The transition has been found to occur at a lower temperature for the higher value of the amplitude of the propagating magnetic field wave. A comprehensive phase boundary was drawn. The phase boundary has been found to be insensitive to the wavelength of the propagating field wave. The boundary encloses more area of the region of the ordered phase for stronger anisotropy.