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 20.64: Poster
Montag, 7. März 2005, 14:00–18:00, Poster TU C
Dynamic quasi-particle behaviour of geometrically confined domain walls — •Daniel Bedau1, Mathias Kläui1, Ulrich Rüdiger1, Dirk Backes2, L. J. Heyderman2, Giancarlo Faini3, C.A.F. Vaz4 und J.A.C. Bland4 — 1FB Physik, Universität Konstanz, Konstanz, Germany — 2LMN, Paul Scherrer Institut, Villigen, Switzerland — 3LPN-CNRS, Marcoussis, France — 4CavendishLaboratory, University of Cambridge, UK
Geometrically confined domain walls in which the spin structure of a wall can be controlled via the lateral dimensions and film thickness have recently become the focus of intense research. Ferromagnetic rings are of particular interest, since in these structures simple magnetic states with head-to-head domain walls are found that make this geometry suitable for probing domain wall properties, e.g. the pinning at or the repulsion from notches depending on the domain wall type [1]. Transverse domain walls are attracted by constrictions and due to their small lateral dimensions they act as quasi-particles in an attractive potential well. Using magnetoresistance measurements, the depth and the width of the potential well can be determined [2]. To completely characterize the potential ’landscape’, the curvature of the potential well needs to be ascertained by studying dynamic oscillation of the domain wall (resonance frequencies). Apart from the fundamental oscillation, higher-order resonances are found with frequencies in the GHz range.
[1] M. Kläui et al., Phys. Rev. B 68, 134426 (2003), Physica B 343, 343 (2004) [2] M. Kläui et al., Phys. Rev. Lett. 90, 97202 (2003)