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MA: Magnetismus

MA 20: Poster:Schichten(1-29),Spintrsp(30-45),Ex-Bias(46-63),Spindyn(64-75),Mikromat.(76-80),Cluster(81-94),Abbv.(95-99),Obflm(100-02),SpElek.(103-09),E-Theo(110-14),Mikromag.(115-16),Spin+PÜ(117-26),Mag.Mat.(127-51),Meth.(152-55),Mol.Mag(156-59),Kondo(160-65

MA 20.36: Poster

Monday, March 7, 2005, 14:00–18:00, Poster TU C

Magnetotransport measurements and simulations of permalloy microstructures — •J. Kruse, R. Eiselt, M. Bolte, M. Steiner, U. Merkt, and G. Meier — Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung, Universität Hamburg, Jungiusstrasse 11, 20355 Hamburg, Germany

Spatially resolved measurements and simulations of magnetoresistance effects are required for a detailed understanding of magneto-transport in magnetic micro- and nanostructures at the fundamental level [1]. The anisotropic magnetoresistance of permalloy microstructures of various geometries are measured in the temperature range between 2 K and 300 K. We investigate rectangles of 20 nm, 40 nm, and 70 nm thickness with different aspect ratios and in addition rounded structures we address as eggs, beans, and lemons. By transport measurements, micromagnetic simulations, and magnetic-force microscopy we can clearly identify magnetic configurations and their electrical resistances. For the rectangular geometry we plan to study barber pole structures to linearize the magnetoresistance effect [2].

[1] R. Meckenstock, M.V. Rastei, and J.P. Bucher, J. Appl. Phys. 95, 6753 (2004).

[2] Philips Semiconductors, Data Sheet SC17 (2000).