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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.