Nonequilibrium tricritical behaviour in anisotropic XY ferromagnet driven by elliptically polarised propagating magnetic field wave

Abstract

Three dimensional anisotropic XY ferromagnet driven by elliptically polarized propagating magnetic field wave has been extensively investigated by Monte Carlo simulation with Metropolis single spin flip algorithm. Both the effects of the bilinear exchange type and the single site anisotropies are thoroughly investigated. The time average magnetisation (over the complete cycle of the elliptically polarized propagating magnetic field wave) components play the role of dynamic order parameter. For fixed set of values of the strength of anisotropy and the field amplitudes, the system has been found to get dynamically ordered at a pseudocritical temperature. The pseudocritical temperature of such dynamic nonequilibrium phase transition has been found to depend on both the strength of anisotropy and the amplitudes of the elliptically polarized propagating magnetic field wave. A comprehensive phase diagram is represented here in the form of image plot of the pseudocritical temperature in the plane formed by the strength of anisotropy and field amplitudes. Interestingly, this nonequilibrium phase transition has been found discontinuous (first order) for higher values of the field amplitude and lower values of the anisotropy. On the other hand, the continuous (second order) transition has been noticed for lower values of the field amplitude and higher values of the anisotropy.

15 pages Latex and 14 captioned pdf figures; to appear in Physica A (2024)

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