Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2006-10-16
Physics
Condensed Matter
Statistical Mechanics
10 LaTeX pages, 13 eps figures. Submitted to PRB on 30 June 2006. Accepted on 10 October 2006
Scientific paper
10.1103/PhysRevB.74.184416
We simulate antiferromagnetic thin films. Dipole-dipole and antiferromagnetic exchange interactions as well as uniaxial and quadrupolar anisotropies are taken into account. Various phases unfold as the corresponding parameters, J, D and C, as well as the temperature T and the number n of film layers vary. We find (1) how the strength Delta_m of the anisotropy arising from dipole-dipole interactions varies with the number of layers m away from the film's surface, with J and with n; (2) a unified phase diagram for all n-layer films and bulk systems; (3) a layer dependent spin reorientation (SR) phase in which spins rotate continuously as T, D, C and n vary; (4) that the ratio of the SR to the ordering temperature depends (approximately) on n only through (D+Delta/n)/C, and hardly on J; (5) a phase transformation between two different magnetic orderings, in which spin orientations may or may not change, for some values of J, by varying n.
Alonso Juan J.
Fernandez Julio F.
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