Dynamic-symmetry-breaking breathing and spreading transitions in ferromagnetic film irradiated by spherical electromagnetic wave

Acharyya, Muktish

doi:10.1016/j.jmmm.2013.11.037

Cited by 12 publications

(6 citation statements)

References 37 publications

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“…It is clear that these microscopic behaviors sensitively depend on the studied system parameters. We should note that these types of coherent propagations of spin bands and also spin-frozen phases have been recently observed in bulk materials under the existence of a propagating magnetic field [21][22][23].…”

Section: Resultssupporting

confidence: 56%

“…However, a decrement in the value of temperature leads to the occurrence of spinfrozen or spin pinned phase. This phase generally occurs at the relatively lower temperature regions, as in the case of the conventional bulk systems under the influence of a propagating magnetic field [21][22][23].…”

Section: Discussionmentioning

confidence: 97%

“…In addition to the works regarding the influences of an oscillating magnetic field (uniform over space) on the dynamic characteristics of the magnetic systems, some efforts were taken to investigate the dynamic features resulting from standing and/or propagating magnetic field waves [21][22][23][24]. It is possible to say that propagating magnetic field wave is an example of spatially and also of temporally changed magnetic field being exposed to a magnetic system.…”

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confidence: 99%

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Dynamic phase transition features of the cylindrical nanowire driven by a propagating magnetic field

Vatansever¹

2018

Academic Platform Journal of Engineering and Science

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Magnetic response of the spin-1/2 cylindrical nanowire to the propagating magnetic field wave has been investigated by means of Monte Carlo simulation method based on Metropolis algorithm. The obtained microscopic spin configurations suggest that the studied system exhibits two types of dynamical phases depending on the considered values of system parameters: Coherent propagation of spin bands and spin-frozen or pinned phases, as in the case of the conventional bulk systems under the influence of a propagating magnetic field. By benefiting from the temperature dependencies of variances of dynamic order parameter, internal energy and the derivative of dynamic order parameter of the system, dynamic phase diagrams are also obtained in related planes for varying values of the wavelength of the propagating magnetic field. Our simulation results demonstrate that as the strength of the field amplitude is increased, the phase transition points tend to shift to the relatively lower temperature regions. Moreover, it has been observed that dynamic phase boundary line shrinks inward when the value of wavelength of the external field decreases.

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Section: Resultssupporting

confidence: 56%

Section: Discussionmentioning

confidence: 97%

mentioning

confidence: 99%

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Dynamic phase transition features of the cylindrical nanowire driven by a propagating magnetic field

Vatansever¹

2018

Academic Platform Journal of Engineering and Science

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“…In the case of standing magnetic wave [9], standing spin band modes (in the high temperature) are observed. The similar studies are performed with standing magnetic wave [10] in random field Ising ferromagnet and the exact mathematical form of the phase boundary is found, the breathing and spreading transitions are found in Ising ferromagnet driven by spherical magnetic wave [11], the dynamic transitions are studied in Blume-Capel model [12] driven by propagating and standing magnetic wave. The nonequilibrium multiple phase transition was observed [13] in Ising metamagnet driven by propagating magnetic field wave.…”

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confidence: 86%

Driven spin wave modes in XY ferromagnet: non-equilibrium phase transition

Acharyya

2018

Phase Transitions

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The dynamical responses of XY ferromagnet driven by linearly polarised propagating and standing magnetic field wave have been studied by Monte Carlo simulation in three dimensions. In the case of propagating magnetic field wave (with specified amplitude, frequency and the wavelength), the low temperature dynamical mode is a propagating spin wave and the system becomes structureless (or random) in the high temperature. A dynamical symmetry breaking phase transition is observed at a finite (nonzero) temperature. This symmetry breaking is confirmed by studying the statistical distribution of the angle of the spin vector. The dynamic nonequilibrium transition temperature was found to decrease as the amplitude of the propagating magnetic field wave increased. A comprehensive phase boundary is drawn in the plane formed by temperature and amplitude of propagating field wave. The phase boundary was observed to shrink (in the low temperature side) for longer wavelength of the propagating magnetic wave. In the case of standing magnetic field wave, the low temperature excitation is a standing spin wave which becomes structureless (or random) in the high temperature. Here also, like the case of propagating magnetic wave, a dynamical symmetry breaking nonequilibrium phase transition was observed. A comprehensive phase boundary was drawn. Unlike the case of propagating magnetic wave, the phase boundary does not show any systematic variation with the wavelength of the standing magnetic field wave. In the limit of vanishingly small amplitude of the field, the phase boundaries approach the recent Monte Carlo estimate of equilibrium transition temperature. I. Introduction:The nonequilibrium responses of Ising ferromagnet to an oscillating (in time but uniform over the space) magnetic field is an interesting field of modern research [1,2]. The nonequilibrium phase transition is one major focus of the investigation. Some important studies may be reported below. The existence of the growth of correlation near the transition was reported [3]. The bulk and surface critical behaviours were studied recently[4] and those are found to belong to different universality class. The anomalous metamagnetic fluctuations near the transition were studied recently [5]. This study was supported by Monte Carlo simulation [6]. Experimentally, a notable transient behaviour was found [7], in the uniaxial cobalt film, for the time period of the field which is faster than a critical time. This is related to the the existence of first order transition. All these studies, mentioned above, are signatures of the current interest in the field of nonequilibrium responses of ferromagnets driven by time varying external magnetic field.One common and important feature of the above mentioned studies, is the time dependence of the external magnetic field, which keeps the system far away from the equilibrium. However, recently the interests have been taken in the case, where the driving magnetic field has both spatial and temporal variations. This spatio-temporal vari...

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“…Recently the propagation of spin clusters and existence of various dynamic phases are observed [17] in random field Ising ferromagnet. In normal ferromagnet, the propagation of circular spin waves are observed [18] in Ising ferromagnet and multiple nonequilibrium phase transitions are found. The importance of all these studies mentioned above is not merely pedagogical.…”

Section: Introductionmentioning

confidence: 99%

Spin flip statistics and spin wave interference patterns in Ising ferromagnetic films: A Monte Carlo study

Acharyya

2017

Heliyon

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The spin wave interference is studied in two dimensional Ising ferromagnet driven by two coherent spherical magnetic field waves by Monte Carlo simulation. The spin waves are found to propagate and interfere according to the classic rule of interference pattern generated by two point sources. The interference pattern of spin wave is observed in one boundary of the lattice. The interference pattern is detected and studied by spin flip statistics at high and low temperatures. The destructive interference is manifested as the large number of spin flips and vice versa.

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Dynamic-symmetry-breaking breathing and spreading transitions in ferromagnetic film irradiated by spherical electromagnetic wave

Cited by 12 publications

References 37 publications

Dynamic phase transition features of the cylindrical nanowire driven by a propagating magnetic field

Dynamic phase transition features of the cylindrical nanowire driven by a propagating magnetic field

Driven spin wave modes in XY ferromagnet: non-equilibrium phase transition

Spin flip statistics and spin wave interference patterns in Ising ferromagnetic films: A Monte Carlo study

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