Regensburg 2007 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 15: Poster:ThinFilms(1-33),Transp.(34-49),ExchBias(50-56),
Spindynamics(57-70),Micro-nanostr.Mat.(71-82),
Particles/Clust.(83-88), Mag.Imag./Surface(89-96),
Spinelectronics(97-109), Theory/Micromag.(110-116),
Spinstruct/Phasetr.(117-128),Magn.Mat.(129-139),
Aniso.+Measuring(140-145), MolMag.(146-152),
MSMA(153-156)

MA 15.31: Poster

Dienstag, 27. März 2007, 15:00–19:00, Poster A

Green Function theory vs. Quantum Monte Carlo Calculation for thin magnetic films — •Sören Henning¹, Fritz Körmann¹, Stefan Schwieger², Jochen Kienert¹, and Wolfgang Nolting¹ — ¹Lehrstuhl Festkörpertheorie, Institut für Physik, Humboldt-Universität zu Berlin, Newtonstrasse 15, 12489 Berlin, Germany — ²Technische Universität Ilmenau, Theoretische Physik I, Postfach 100565, 98684 Ilmenau, Germany

Up to now comparison between numerically exact Quantum Monte Carlo (QMC) calculations and Green function (GF) theory of thin magnetic films including second order anisotropies are only available for easy axis systems, i.e. for systems that favour a magnetization perpendicular to the film plane. Unfortunately there are no QMC data available for easy plane systems for which the anisotropy favours the magnetization parallel to the film plane. In this work we will discuss these systems. We present temperature and field dependent transitions and obtain good agreement between QMC results and Green function theory. Besides that we found an interesting magnetic disorder-order transition for increasing temperature.