Berlin 2012 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 16: Magnetic Particles / Clusters II
MA 16.2: Vortrag
Dienstag, 27. März 2012, 09:45–10:00, EB 202
Time-resolved measurements of domain wall movement assisted particle transport on magnetically patterned samples — •Daniel Lengemann1, Dennis Holzinger1, Larysa Baraban2, Dieter Engel1, and Arno Ehresmann1 — 1Department of Physics and Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), University of Kassel, Heinrich-Plett-Str. 40, D-34132 Kassel — 2Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden (IFW), Dresden, Helmholtzstraße 20, D-01069 Dresden
IrMn/CoFe exchange biased layers were patterned into artificial parallel stripe magnetic domains with alternating magnetization directions in adjacent stripes perpendicular to the long axis of the stripes. In remanence superparamagnetic particles have been trapped in the inhomogeneous stray fields of Bloch domain walls. The different magnetization reversal mechanisms in each hysteresis loop branch cause a stepwise movement of the trapped particles [1].
Time-resolved measurements with synchronization of the video feed and the magnetic field pulses in x- and z-direction were performed to measure the particle velocity, the movement type and the magnetic field range where the movement takes place.
[1] Ehresmann, A., Lengemann, D., Weis, T., Albrecht, A., Langfahl-Klabes, J., Göllner, F. and Engel, D., Advanced Materials, doi: 10.1002/adma.201103264 (2011)