Dresden 2011 – scientific programme
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MA: Fachverband Magnetismus
MA 19: Poster I (Bio- and Molecular Magnetism/ Magnetic Particles and Clusters/ Micro- and Nanostructured Magnetic Materials/ Magnetic Materials/ Multiferroics/ Magnetic Shape Memory Alloys/ Electron Theory of Magntism/ Spincaloric Transport/ Magnetic Coupling and Exchange Bias/ Magnetization Dynamics/ Micromagnetism and Computational Magnetics)
MA 19.35: Poster
Tuesday, March 15, 2011, 10:45–13:00, P2
Preparation of domain walls in cylindrical nanowires — •Judith Kimling1, Stephan Martens1, Kristina Pitzschel1, Tim Böhnert1, Michael Martens1, Peter Lendecke1, Lars Bocklage1, Victor Vega2, Florian Kronast3, Ulrich Merkt1, Kornelius Nielsch1, and Guido Meier1 — 1Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung Hamburg, Universität Hamburg, Germany — 2Departamento de Física, Universidad de Oviedo, Asturias, Spain — 3Helmholtz-Zentrum Berlin für Materialien und Energie, BESSY, Germany
Electrodeposition of ferromagnetic materials in self-organized nanopores of an alumina membrane provides the unique ability to process ultrathin wires of complex shape and with reproducible properties [1]. For both fundamental research and technological applications it is of interest to understand the nucleation, propagation and pinning of domain walls in such nanostructures. We synthesized nickel and permalloy nanowires with diameters between 30 nm and 300 nm and aspect ratios up to 1000. The magnetization reversal of single wires was studied by magnetic force microscopy, magnetoresistance measurements, magneto-optical Kerr-effect and X-ray photoemission electron microscopy in straight wires, in bent wires, and in wires with diameter modulations serving as tailored pinning sites.
[1] K. Nielsch et al., Handbook of Magnetism and Adv. Magnet. Mat., Vol. 4, John Wiley and Sons, Ltd., Chichester, 2007.
Financial support by the DFG via SFB 668, GrK 1286, and SPP 1165 is gratefully acknowledged.