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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 20.68: Poster
Dienstag, 28. März 2006, 15:15–19:15, P1
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, and J.A.C. Bland4 — 1FB Physik, Universität Konstanz, Konstanz, Germany — 2LMN, Paul Scherrer Institut, Villigen, Switzerland — 3LPN-CNRS, Marcoussis, France — 4Cavendish Laboratory, University of Cambridge, UK
Due to their small lateral dimensions domain walls behave like quasi-particles in an attractive potential well.
We have chosen ferromagnetic rings because in these structures simple magnetic states with head-to-head domain walls are found making this geometry suitable for probing domain wall properties, e.g. pinning at or repulsion from notches which depend on the specific domain wall type [1]. Different types of domain walls are either attracted or repelled by constrictions. The depth and the width of the potential well which correspond to the shape of the pinning potential have been determined using magnetoresistance measurements [2,3]. To completely characterize the potential landscape, the curvature of the potential well needs to be ascertained. This can be achieved by studying the behaviour of a domain wall under periodic excitation. For this purpose a new setup has been constructed allowing magnetoresistance measurements at low temperatures under high frequency excitation from 100 MHz to 20 GHz. [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) [3] M. Kläui et al., APL 87, 102509 (2005)