Nucleation in Ising ferromagnet by a field spatially spreading in time

Acharyya, Muktish

doi:10.1016/j.physa.2014.02.020

Cited by 12 publications

(9 citation statements)

References 19 publications

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“…In the first part of our work, we have considered the uniformly applied magnetic field and the temperature has a spatial variation along the x direction only), instead of the considering the spatially uniform (temperature) cases in the previous studies [3] , [9] , [13] . As a result there is a gradient in temperature between the temperature of the left edge and the right edge of the lattice.…”

Section: Modelmentioning

confidence: 99%

“…The magnetisation reversal transition was studied [8] in Ising model driven by an impulsive magnetic field and a phase boundary has been drawn. Recently, the nucleation and magnetisation reversal have been studied [9] in Ising ferromagnet driven by a field spreading in time. Here the competing effects of reversal time and the rate of spreading have been discussed.…”

Section: Introductionmentioning

confidence: 99%

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Magnetisation reversal in Ising ferromagnet by thermal and field gradients

Datta

Acharyya

Dhar

2018

Heliyon

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We report the results of the magnetisation reversal in Ising ferromagnet having thermal and field gradients by Monte Carlo simulation. We have studied the distribution of reversal times for different values of thermal and field gradients and compared the results with those obtained for uniform temperature. The movement of the domain wall of distinct domains and the growth of roughness of domain wall have also been studied statistically. The role of competing thermal and field gradients, in the reversal mechanism, was also studied and a line of marginal competition was obtained.

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Section: Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Magnetisation reversal in Ising ferromagnet by thermal and field gradients

Datta

Acharyya

Dhar

2018

Heliyon

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“…The reversal with nonuniform (over space) magnetic field was also investigated [13] and a marginally competitive line was drawn [14] in the plane formed by the gradient of field and the gradient of temperature. The switching of magnetisation was investigated in Ising ferromagnets by periodic pulsed [15,16] magnetic field and a time dependent field like spreading Gaussian [17]. The relaxation of Ising ferromagnet after a sudden reversal of applied magnetic field is also studied [18].…”

Section: Introductionmentioning

confidence: 99%

Metastability in graded and step like variation of field and anisotropy of the Blume-Capel ferromagnet

Naskar,

Acharyya

2020

Preprint

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The metastable behaviour of two dimensional anisotropic Blume-Capel ferromagnet under the influence of graded and stepped magnetic field has been investigated by extensive Monte Carlo simulation using Metropolis single spin flip algorithm. Starting from the initial perfectly ordered state, reversal of magnetisation has been studied in presence of the field. Metastable lifetime or the reversal time of magnetisation for the system having uniform anisotropy and in the presence of both graded and stepped field has been studied. Also the same has been explored for a graded and stepped anisotropic system in presence of a uniform field. Finite size effect is analyzed for the variation of reversal time with gradient of field (G h ) and a scaling relation) is found out. Spatial variation of density profile for the projection states (i.e., +1, 0 and -1) has also been studied at the moment of reversal of magnetisation. The spatial variation of the number of spin flips per site is studied. Motion of the interface (or domain wall) with the gradient of field and gradient of anisotropy are investigated and are found to follow the hyperbolic tangent like behaviours in both cases. Since, both the anisotropy and the applied field have significant impact on the metastable lifetime, an interesting competitive scenario is observed for a graded anisotropic system in graded field and a stepped anisotropic system in stepped field. A line of marginal competition has been found out for both the cases separating the regions of field dominated reversal and anisotropy dominated reversal.

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“…An oscillating (in time) and uniform (in space) magnetic field yields dynamic phase transition accompanied by dynamic symmetry breaking. Very recently, [2,3,4,5,6] the responses of Ising ferromagnet to a magnetic field having spatio-temporal variation, have become an interesting subject of investigations. The classical nucleation phenomenon has been studied [2] in Ising ferromagnet in presence of a field having spatio-temporal (spreading Gaussian) variation.…”

Section: Introductionmentioning

confidence: 99%

“…Very recently, [2,3,4,5,6] the responses of Ising ferromagnet to a magnetic field having spatio-temporal variation, have become an interesting subject of investigations. The classical nucleation phenomenon has been studied [2] in Ising ferromagnet in presence of a field having spatio-temporal (spreading Gaussian) variation. Here, existence of a new time scale was mentioned.…”

Section: Introductionmentioning

confidence: 99%

Ising metamagnet driven by propagating magnetic field wave: Nonequilibrium phases and transitions

Acharyya

2015

Journal of Magnetism and Magnetic Materials

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a b s t r a c tThe nonequilibrium responses of Ising metamagnet (layered antiferromagnet) to the propagating magnetic wave are studied by Monte Carlo simulation. Here, the spatio-temporal variations of magnetic field keep the system away from equilibrium. The sublattice magnetisations show dynamical symmetry breaking in the low temperature ordered phase. The nonequilibrium phase transitions are studied from the temperature dependences of dynamic staggered order parameter, its derivative and the dynamic specific heat. The transitions are marked by the peak position of dynamic specific heat and the position of dip of the derivative of dynamic staggered order parameter. It is observed that, for lower values of the amplitudes of the propagating magnetic field, if the system is cooled from a high temperature, it undergoes a phase transition showing sharp peak of dynamic specific heat and sharp dip of the derivative of the dynamic staggered order parameter. However, for higher values of the amplitude of the propagating magnetic field, system exhibits multiple phase transitions. A comprehensive phase diagram is also plotted. The transition, for vanishingly small value of the amplitude of the propagating wave, is very close to that for equilibrium ferro-para phase transition of cubic Ising ferromagnet.

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Nucleation in Ising ferromagnet by a field spatially spreading in time

Cited by 12 publications

References 19 publications

Magnetisation reversal in Ising ferromagnet by thermal and field gradients

Magnetisation reversal in Ising ferromagnet by thermal and field gradients

Metastability in graded and step like variation of field and anisotropy of the Blume-Capel ferromagnet

Ising metamagnet driven by propagating magnetic field wave: Nonequilibrium phases and transitions

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