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MA: Magnetismus

MA 27: Spinstrukturen und magnetische Phasenüberg
änge

MA 27.3: Vortrag

Donnerstag, 27. März 2003, 15:45–16:00, HSZ/405

Spatially modulated magnetic structures in thin films — •Michel Pleimling¹, Walter Selke², and Daniel Catrein³ — ¹Institut für Theoretische Physik 1, Universität Erlangen-Nürnberg, D-91058 Erlangen, Germany — ²Institut für Theoretische Physik, Technische Hochschule, D-52056 Aachen, Germany — ³Institut für Stochastische Mathematik, Technische Hochschule, D-52056 Aachen, Germany

The axial next–nearest–neighbour Ising (ANNNI) model of finite thickness L is studied. Using mean–field theory, Monte Carlo simulations, and low–temperature analyses, phase diagrams are determined, with a distinct phase diagram for each film thickness [1,2]. The robustness of the phase diagrams against varying the couplings in the surface layers is analysed. Results are compared to those for the ANNNI model in the limit L —→ ∞.

[1] W. Selke, D. Catrein, and M. Pleimling, J. Phys. A: Math. Gen. 33, L459 (2000).

[2] W. Selke, M. Pleimling, and D. Catrein, Eur. Phys. J. B 27, 321 (2002).