Please use this identifier to cite or link to this item: http://repository.aaup.edu/jspui/handle/123456789/1350
Title: Evidence for a Reorientation Transition in a Two-dimensional Dipolar Antiferromagnetic Heisenberg Model
Authors: Abu-Labdeh, Abdel-Rahman$AAUP$Palestinian
Whitehead, John$Other$Other
De'Bell, Keith$Other$Other
MacIsaac, Allan$Other$Other
Issue Date: Mar-2004
Abstract: Based on Monte Carlo simulations, the results for the two- dimensional Heisenberg model consisting of classical spin vectors arranged on the vertices of a square lattice in which the spins interact through an antiferromagnetic exchange interaction, a magnetic surface anisotropy and the dipolar interaction are presented. The simulations focus on the exchange dominated regime in which the strength of the exchange interaction is significantly greater than both the dipolar interaction and the magnetic surface anisotropy. The results from the simulations show that there exists a range of the magnetic surface anisotropy parameter values in which the system exhibits a reorientation transition from planar antiferromagnetic phase at low temperature to a perpendicular antiferromagnetic phase at higher temperature. The phase diagram, obtained from the Monte Carlo calculations, is determined as a function of both temperature and parallel magnetic surface anisotropy parameter for a fixed value of the exchange constant. In addition, the low temperature magnetisation data suggests a softening of a spin wave stiffness close to the phase boundary between the two ordered states.
URI: http://repository.aaup.edu/jspui/handle/123456789/1350
Appears in Collections:Faculty & Staff Scientific Research publications

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