The Spin Reorientation Transition and Phase Diagram of Ultrathin Ferromagnetic Films

Details The Spin Reorientation Transition and Phase Diagram of Ultrathin Ferromagnetic Films The Spin Reorientation Transition and Phase Diagram of Ultrathin Ferromagnetic Films

2007-12-14

arxiv.org/abs/0712.2426v1

PRB 77, 134417 (2008)

Physics

Condensed Matter

Disordered Systems and Neural Networks

9 pages, 13 figures

Scientific paper

10.1103/PhysRevB.77.134417

We show results from Monte Carlo simulations of a two dimensional Heisenberg model for ultrathin films with perpendicular anisotropy. A complete phase diagram is obtained as a function of anisotropy and temperature, spanning a wide range of behavior. We discuss our results in relation with experimental findings in different ultrathin films. We observe and characterize a line of Spin Reorientation Transitions . This transition from out of plane stripe order to in plane ferromagnetic order presents a paramagnetic gap in between in a finite region in parameter space, as reported in experiments. For large anisotropies direct transitions from a low temperature stripe phase to a paramagnetic or tetragonal phase with dominant perpendicular magnetization is observed, also in agreement with experiments. We also show the phase diagram for a system without exchange, i.e. with pure dipolar and anisotropy interactions. It shows a similar behavior to the ferromagnetic case with antiferromagnetic instead of stripe phases at low temperatures. A Spin Reorientation Transition is also found in this case.

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