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The universality class of the dynamic magnetisation-reversal transition,induced by a competing field pulse, in an Ising model on a square lattice,below its static ordering temperature, is studied here using Monte Carlosimulations. Fourth order cumulant of the order parameter distribution isstudied for different system sizes around the phase boundary region. Thecrossing point of the cumulant (for different system sizes) gives thetransition point and the value of the cumulant at the transition pointindicates the universality class of the transition. The cumulant value at thecrossing point for low temperature and pulse width range is observed to besignificantly less than that for the static transition in the sametwo-dimensional Ising model. The finite size scaling behaviour in this rangealso indicates a higher correlation length exponent value. For highertemperature and pulse width range, the transition seems to fall in a mean-fieldlike universality class.Comment: 5 pages, 8 eps figures, thoroughly revised manuscript with new  figures, accepted in Phys. Rev. E (2003

Fluctuation cumulant behavior for the field-pulse-induced magnetization-reversal transition in Ising models