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Dynamic response of an Ising system to a pulsed field

Acharyya, M and Bhattacharjee, JK and Chakrabarti, BK (1997) Dynamic response of an Ising system to a pulsed field. In: Physical Review E, 55 (3, Par). pp. 2392-2396.

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Official URL: http://pre.aps.org/abstract/PRE/v55/i3/p2392_1

Abstract

The dynamical response to a pulsed magnetic field has been studied here both using Monte Carlo simulation and by solving numerically the mean-field dynamical equation of motion for the Ising model. The ratio R(p) of the response magnetization half-width to the width of the external field pulse has been observed to diverge and pulse susceptibility chi(p) (ratio of the response magnetization peak height and the pulse height) gives a peak near the order-disorder transition temperature T-c (for the unperturbed system). The Monte Carlo results for the Ising system on a square lattice show that R(p) diverges at T-c, with the exponent nu z congruent to 2.0, while chi(p) shows a peak at T-c(e), which is a function of the field pulse width delta t. A finite-size (in time) scaling analysis shows that T-c(e) = T-c + C(delta t)(-1/x), with x=nu z congruent to 2.0. The mean-field results show that both the divergence of R and the peak in chi(p) occur at the mean-field transition temperature, while the peak height in chi(p) similar to(delta t)(y), y congruent to 1 for small values of delta t. These results also compare well with an approximate analytical solution of the mean-field equation of motion.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to American Physical Society.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 09 Jul 2009 10:12
Last Modified: 24 Feb 2012 07:15
URI: http://eprints.iisc.ernet.in/id/eprint/18875

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