Regensburg 2010 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 33: Poster II
MA 33.25: Poster
Freitag, 26. März 2010, 11:00–14:00, Poster B1
Controlled reduction of the nucleation field in Co/Pt multilayer wires — •Judith Moser1, André Kobs1, Andreas Vogel1, Theo Gerhardt1, Markus Bolte1, Mi-Young Im2, Peter Fischer2, Sebastian Wintz3, Ulrich Merkt1, Hans Peter Oepen1, and Guido Meier1 — 1Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung, Universität Hamburg, Germany — 2Center for X-ray Optics, Lawrence Berkeley National Laboratory, Berkeley, CA, USA — 3Institut für Ionenstrahlphysik und Materialforschung, Forschungszentrum Dresden-Rossendorf, Dresden, Germany
Due to their narrow domain walls, nanowires with high uniaxial out-of plane anisotropy are interesting candidates for spin-momentum transfer studies. Since high current densities can change or destroy the wires investigated, weak pinning potentials allowing the controlled and reliable depinning of domain walls at low current densities are desirable. A prerequisite for the preparation of a domain wall at such pinning sites are nucleation fields smaller than the fields required to depin the domain wall from the respective pinning site. We suggest two methods to tune the nucleation field of lithographically designed Co/Pt multilayer wires. The magnetization reversal of the wires is investigated by means of transmission X-ray microscopy. An up to fourfold reduction of the nucleation field could be achieved through altering the lateral shape of the wires or by depositing Fe stripes on top.
The authors gratefully acknowledge financial support by the DFG and the DOE.