Dresden 2011 – scientific programme
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KR: Fachgruppe Kristallographie
KR 5: Poster Multiferroics (Joint Session of MA, DF, DS, KR, TT)
KR 5.34: Poster
Tuesday, March 15, 2011, 10:45–13:00, P2
Preparation of domain walls in Co/Pt multilayer wires — •Judith Kimling1, Andreas Vogel1, André Kobs1, Lars Bocklage1, Sebastian Wintz2, Jürgen Fassbender2, Mi-Young Im3, Peter Fischer3, Ulrich Merkt1, Hans Peter Oepen1, and Guido Meier1 — 1Institute of Applied Physics and Microstructure Research Center Hamburg, University of Hamburg, Germany — 2Institute of Ion-Beam Physics and Materials Research, Helmholtz-Zentrum Dresden - Rossendorf, Dresden, Germany — 3Center for X-ray Optics, Lawrence Berkeley National Laboratory, Berkeley, USA
Current-induced domain wall motion for studies of spin momentum transfer requires the reliable preparation of domain walls. Since high current densities can alter or destroy the structures investigated, weak pinning potentials 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 is that the domain wall nucleates at a field smaller than the field required to depin the domain wall. We suggest methods to tune the nucleation field of lithographically patterned Co/Pt multilayer wires. An up to fourfold reduction of the nucleation field could be achieved through altering the lateral shape of the wires or by depositing iron stripes on top. Furthermore we explored the applicability of geometric constrictions and ion implantation for the creation of pinning sites. The magnetization reversal in the structures was imaged by transmission X-ray microscopy.
Financial support by the DFG via SFB 668 and GrK 1286 as well as by BES Mat Sci&Eng Div at DOE is gratefully acknowledged.