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 20.75: Poster

Montag, 7. März 2005, 14:00–18:00, Poster TU C

Dynamic properties of geometrically confined domain walls — •Frederik Wegelin¹, Alexander Krasyuk¹, Mathias Kläui², Hans-Joachim Elmers¹ und Gerhard Schönhense¹ — ¹Johannes Gutenberg-Universität Mainz — ²FB Physik, Universität Konstanz

The critical property for the use of any ferromagnetic nanostructure in applications such as memory or sensor devices is the magnetodynamic switching. While switching by coherent rotation has been widely studied [1], recently switching by domain wall motion has become the focus of intense investigations, since large wall velocities have been observed by Kerr microscopy [2]. To gain a deeper understanding the of domain wall dynamics, we have probed the nanoscale domain wall spin structure in real time using time resolved photoemission electron microscopy (XMCD-PEEM). Micron-sized permalloy structures with square, round and ring geometries have been excited by field pulses down to 100ps length and the magnetization dynamics has been probed with 3ps long x-ray pulses. The propagation and the modification of the domain wall spin structure have been measured during the pulse injection. In particular we observe oscillatory behaviour of transverse head-to-head domain walls [3] in rings, when subjected to 300 ps field pulses.

[1] H. W. Schumacher et al., Phys. Rev. Lett. 90, 17201 (2003) [2] D. Atkinson et al., Nature Mat. 2, 85 (2003) [3] M. Kläui et al., J. Phys.: Condens. Matter 15, R985 (2003)