Theoretical simulation of the anisotropic phases of antiferromagnetic thin films

Details Theoretical simulation of the anisotropic phases of antiferromagnetic thin films Theoretical simulation of the anisotropic phases of antiferromagnetic thin films

2006-10-16

arxiv.org/abs/cond-mat/0610418v1

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.

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