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MA: Magnetismus

MA 20: Poster: Films(1-36) Transp(37-56) Ex.Bias(57-67) Spindyn(68-80) Micromag(81-95) Particle(96-109) Imag.+Surface(110-113) Spinelectr(114-122) Theory+Micromag(123-131) Spinstr+Aniso(132-142) MagMat(143-156) Meas(157,158) MolMag+Kondo(159-162) Postdead(163-)

MA 20.34: Poster

Tuesday, March 28, 2006, 15:15–19:15, P1

Magnetic reorientation and breakdown of Landau-Lifshitz theory — •Stephan Schwieger, Jochen Kienert, and Wolfgang Nolting — Humboldt-Universität zu Berlin*Institut für Physik*Theoretische Festkörperphysik*Newtonstraße 15*D-12489 Berlin

A theory is proposed which yields excellent results for the magnetic reorientation transition in ultrathin metallic films. Thermodynamic properties as well as spin wave excitation spectra are presented and compared to classical Landau-Lifshitz theory onto which our microscopic approach can be mapped and which is widely used in the evaluation of experiments on metallic films and interlayer exchange coupled systems. It is found that, in two dimensions, the classical theory breaks down at the reorientation transition.