Reversal of magnetisation in Ising ferromagnet by the field having gradient

Abstract

We have studied the reversal of magnetisation in Ising ferromagnet by the field having gradient along a particular direction. We employed the Monte Carlo simulation with Metropolis single spin flip algorithm. The average lifetime of the metastable state was observed to increase with the magnitude of the gradient of applied field. In the high gradient regime, the system was observed to show two distinct region of up and down spins. The interface or the domain wall was observed to move as one increases the gradient. The displacement of the mean position of the interface was observed to increase with the gradient as hyperbolic tangent function. The roughness of the interface was observed to decay exponentially as the gradient increases. The number of spin flip per site was observed to show a discontinuity in the vicinity of the domain wall. The amount of the discontinuity was found to diverge with the system size as a power law fashion with an exponent 5/3.

17 pages latex including 8 captioned figures

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Cited by in corpus (7)

• Effects of random fields on the reversal of magnetisation of Ising ferromagnet
• 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
• Anisotropy driven reversal of magnetisation in Blume-Capel ferromagnet: A Monte Carlo study
• Dynamical response of the Ising model to the amplitude modulated time dependent magnetic field
• Theoretical studies on switching of magnetisation in thin film
• Competitive metastable behaviours of surface and bulk in Ising ferromagnet