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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

Dienstag, 15. März 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.