Dresden 2009 – scientific programme
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MA: Fachverband Magnetismus
MA 40: Poster II: Bio- and Molecular Magnetism (1-9); Magnetic Coupling Phenomena/Exchange Bias (10-15); Magnetic Particlicles and Clusters (16-29); Micro and Nanostructured Magnetic Materials (30-51); Multiferroics (52-64); Spin Injection in Heterostructures (65-67); Spin-Dyn./Spin-Torque (68-93); Spindependent Transport (94-108)
MA 40.34: Poster
Friday, March 27, 2009, 11:00–14:00, P1A
Magnetoresistance Measurements of Magnetic Nanowires Lithographically Contacted by an Optical Microscope — •Tim Böhnert, Judith Moser, Kristina Pitzschel, Shadyar Farhangfar, Robert Zierold, Lars Bocklage, Ulrich Merkt, Guido Meier, and Kornelius Nielsch — Institut für Angewandte Physik, Universität Hamburg
We fabricate µ m-sized structures using projection photolithography with a modified optical microscope. This setup provides a fast and simple way to four-point measurements on individual nanowires. A 2 x 2 cm2 rotatable printed foil mask can be projected on an area down to 300 x 300 µ m2 allowing us to create µ m-sized features. The technique grants complete visual control over the mask alignment, which is a huge advantage compared to conventional lithography techniques for contacting prepatterned structures. We define four probe low-ohmic contacts to electrochemically synthesized Ni nanowires of different diameters. The switching behavior of the wires is studied by anisotropic magnetoresistance measurements. We will present details of the sample processing and first magnetoresistance measurements. The goal of the project is investigating the field- and current-induced magnetization reversal in straight wires, in bent wires, and in wires with tailored pinning sites.
The authors gratefully acknowledge financial support by the SFB 668.