Blume-Capel ferromagnet driven by propagating and standing magnetic field wave: Dynamical modes and nonequilibrium phase transition

TL;DR

This study investigates the nonequilibrium dynamical phases of a Blume-Capel ferromagnet under propagating and standing magnetic field waves using Monte Carlo simulations, revealing phase transitions and phase diagrams influenced by temperature, field amplitude, and anisotropy.

Contribution

It provides a detailed analysis of dynamical phase transitions in a Blume-Capel model driven by magnetic waves, including phase diagrams and the effects of anisotropy and field strength.

Findings

Identification of dynamical phases under propagating and standing waves

Phase boundary shifts with anisotropy and field amplitude

Observation of phase transition from propagating to pinned states

Abstract

The dynamical responses of Blume-Capel (S=1) ferromagnet to the plane propagating (with fixed frequency and wavelength) and standing magnetic field waves are studied sepa- rately in two dimensions by extensive Monte Carlo simulation. Depending on the values of temperature, amplitude of the propagating magnetic field and the strength of anisotropy, two different dynamical phases are observed. For a fixed value of anisotropy and the amplitude of the propagating magnetic field, the system undergoes a dynamical phase transition from a driven spin wave propagating phase to a pinned or spin frozen state as the system is cooled down. The time averaged magnetisation over a full cycle of the propagating magnetic field plays the role of the dynamic order parameter. A comprehensive phase diagram is plotted in the plane formed by the amplitude of the propagating wave and the temperature of the system. It is found that the phase boundary shrinks inward as the anisotropy increases. The phase boundary, in the plane described by the strength of the anisotropy and temperature, is also drawn. This phase boundary was observed to shrink inward as the field amplitude increases.