Phase transition in ultrathin magnetic films with long-range interactions: Monte Carlo simulation of the anisotropic Heisenberg model

Abstract

Ultrathin magnetic films can be modeled as an anisotropic Heisenberg model with long-range dipolar interactions. It is believed that the phase diagram presents three phases: An ordered ferromagnetic phase I, a phase characterized by a change from out-of-plane to in-plane in the magnetization II, and a high-temperature paramagnetic phase III. It is claimed that the border lines from phase I to III and II to III are of second order and from I to II is first order. In the present work we have performed a very careful Monte Carlo simulation of the model. Our results strongly support that the line separating phases II and III is of the BKT type.

7 pages

References in corpus (2)

• Soliton and 2D domains in ultra-thin magnetic films
• Monte Carlo Simulations of Ultrathin Magnetic Dots

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• Universality of the Berezinskii-Kosterlitz-Thouless type of phase transition in the dipolar XY-model
• Phase diagram of the two-dimensional dipolar Heisenberg model with the Dzyaloshinskii-Moriya interaction and the Ising anisotropy
• The first-principles study of thermodynamical properties of random magnetic overlayers on fcc-Cu(001) substrate
• Green function theory versus Quantum Monte Carlo calculations for thin magnetic films
• Anisotropy-temperature phase diagram for the two-dimensional dipolar Heisenberg model with and without magnetic field
• Influence of cutoff dipole interaction radius and dilution on phase transition in kagome artificial spin ice
• Phase diagram of the dipolar Ising ferromagnet on a kagome lattice
• Phase transition in the two-dimensional dipolar Planar Rotator model
• Equilibrium and Nonequilibrium phase transitions in continuous symmetric classical magnets