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 40.87: Poster

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

Field- and Current-induced Domain Wall Motion in Ho-doped Permalloy Nanowires probed by single shot Kerr-microscopy — •Philipp Möhrke¹, Thomas A. Moore^1,2, Mathias Kläui¹, Stephen Krzyk¹, Jan Rhensius^1,3, Dirk Backes^1,3, Laura J. Heyderman³, and Ulrich Rüdiger¹ — ¹Universität Konstanz, Fachbereich Physik, Universitätsstraße 10, 78457 Konstanz, Germany — ²SPINTEC, CEA Grenoble, 17 rue des Martyrs, 38054 Grenoble Cedex 9, France — ³Paul Scherrer Institut, 5232 Villingen PSI, Switzerland

We present single shot measurements of field- and current-induced DW dynamics in pure and Holmium-doped Permalloy (Ni₈₀Fe₂₀) nanowires (thickness 20-25 nm, width ≥ 500 nm) by nanosecond time-resolved Kerr-microscopy. We probe the velocity of single DW displacements across a 1 µm spot size located at various positions along the wire and determine the depinning fields and currents.
Results obtained from 1500 nm-wide and 25 nm-thick pure and Ho-doped Py-wire with the laser focused at a position 10 µm away from the starting point of the DWs are presented. DWs were repeatedly prepared at the kinks in the wire, the field ramped from 0 G with a speed of in 1 G/µs and the arrival times / depining fields measured. Measurements on samples, which by doping with Ho, have a different damping constant α show a significant drop of the average velocity with increasing α. These velocities are compared by results obtained from micromagnetic simulations.