Regensburg 2010 – scientific programme
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MA: Fachverband Magnetismus
MA 33: Poster II
MA 33.58: Poster
Friday, March 26, 2010, 11:00–14:00, Poster B1
Current-induced domain wall motion: Separating spin torque and Oersted-field effects in Co/Pt nanowires — •Jan Heinen1, Olivier Boulle1, Kevin Rousseau1, Gregory Malinowski1, Mathias Kläui1, Henk J. Swagton2, Bert Koopmans2, Christian Ulysse3, and Giancarlo Faini3 — 1Universität Konstanz, Fachbereich Physik, D-78457 Konstanz, Germany — 2Eindhoven University of Technology, Department of Applied Physics, MB 5600, Netherlands — 3CNRS, Phynano team, Laboratoire de Photonique et de Nanostructures, 91460 Marcoussis, France
We report on magnetotransport studies on perpendicularly magnetized nanowires with narrow domain wall (DW) structures. Using Co/Pt multilayer nanowires, we have previously shown that Joule heating is concealing most of the current induced domain wall effects, but using a constant sample temperature a large non-adiabacity factor β has been deduced[1]. Here, we carry out experiments for both applied field directions and current polarities, starting from different DW configurations within a Hall cross. We clearly show, using the different symmetries of spin torque and Oersted-field, that the much debated Oersted-field does not contribute to the DW depinning significantly. This allows us to extract the spin torque contribution and the non-adiabacity factor β, which turns out to be in line with previous measurements.
References: [1] O. Boulle et al., Phys. Rev. Lett. 101, 216601 (2008).