Dresden 2009 – wissenschaftliches Programm

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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 40.30: Poster

Freitag, 27. März 2009, 11:00–14:00, P1A

Magnetotransport studies of the anisotropic and domain wall magnetoresistance in Co nanowires — •Francis Bern, Jose Barzola-Quiquia, and Pablo Esquinazi — Division of Superconductivity and Magnetism, University of Leipzig, D-04103 Leipzig

Cobalt wires of width x thickness ∼ 300 … 600 nm ×  35 nm and cross sectional area − length ratios between 1.3 and 4 nm were prepared by electron lithography. The magnetoresistance as a function of field, angle between field and current, and between 4 K and 250 K was measured. The observed domain wall magnetoresistance of −0.65% and an anisotropic magnetoresistance effect of 1.6% at 4 K are higher than in similar works reported in the literature. The measured angle and temperature dependences of the coercive field agree with theoretical expectations. The achieved resolution in the magnetotransport measurements allows us to study the influence of notches and constrictions on the behavior of the magnetoresistance of the nanowires.