Berlin 2005 – wissenschaftliches Programm
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MA: Magnetismus
MA 20: Poster:Schichten(1-29),Spintrsp(30-45),Ex-Bias(46-63),Spindyn(64-75),Mikromat.(76-80),Cluster(81-94),Abbv.(95-99),Obflm(100-02),SpElek.(103-09),E-Theo(110-14),Mikromag.(115-16),Spin+PÜ(117-26),Mag.Mat.(127-51),Meth.(152-55),Mol.Mag(156-59),Kondo(160-65
MA 20.115: Poster
Montag, 7. März 2005, 14:00–18:00, Poster TU C
Breakdown of magnetization in nano-constricted domain walls. — •Natalia Kazantseva, Robert Wieser, Ulrich Nowak, and Klaus D. Usadel — Fachbereich für Physik, Universität Duisburg-Essen, 47048 Duisburg, Germany
The understanding and control of domain wall properties is important for future magneto-electronic applications, but only few publications have considered the influence of finite temperatures on domain walls [1] which becomes increasingly important for decreasing sizes of the magnetic systems considered. We investigate static aspects of nano-constricted domain walls with analytical (micromagnetic) and numerical methods (mean field approximation, Monte Carlo simulation). We find that the magnetization within a domain wall has a stronger temperature dependence than in a region with uniform magnetization. Even a continuous disappearance of the magnetization at a temperature Th below the Curie temperature Tc can be observed inside a domain wall. This effect is much bigger for nano-constricted domain walls. In this case the temperature Th decreases with cos(π/L), where L is the length of the constriction.
ACKNOWLEDGMENTS: Work supported by the Deutsche Forschungsgemeinschaft (SFB 491).
[1] J. Kötzler, D. A. Garanin, M. Hartl, and L. Jahn Phys. Rev. Lett. 71, 177 (1993)