Publication: Effects of a uniform external magnetic field on the magnetic properties of a pure dipolar planar system

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Title	Effects of a uniform external magnetic field on the magnetic properties of a pure dipolar planar system
Authors/Editors*	Abu-Labdeh AM, MacIsaac AB, Whitehead JP, De'Bell K, Cottam MG
Where published*	PHYSICAL REVIEW B
How published*	Journal
Year*	2006
Volume	73
Number	9
Pages	094412
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Abstract	The effects of a uniform external magnetic field, h, on the magnetic properties of a pure dipolar planar system on a square lattice have been investigated for both zero and finite temperature, T. From Monte Carlo simulations, the magnetic phase diagram for this system has been determined as a function of both h and T. At low temperatures and for low values of h the phase diagram shows an antiferromagnetic (dipolar) phase in which the spins are aligned perpendicular to h. For large values of h the equilibrium phase is ferromagnetic, with the spins aligned parallel to h. The results also show that the phase boundary separating these two ordered phases appears to be first order with very weak hysteresis. Moreover, the Monte Carlo results indicate that the phase boundary separating the dipolar antiferromagnetic phase from the paramagnetic phase is second order.