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MA: Fachverband Magnetismus

MA 16: Micro- and Nanostructured Magnetic Materials II

MA 16.9: Vortrag

Mittwoch, 24. März 2010, 12:15–12:30, H23

Hall micromagnetometry of current-assisted domain-wall motion in permalloy nanowires — •Stephan Marauska, Peter Lendecke, Guido Meier, and Ulrich Merkt — Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung, Universität Hamburg, Jungiusstraße 11, 20355 Hamburg, Germany

We use ballistic Hall micromagnetometry to analyze the effect of current-injection on domain-wall (DW) depinning in permalloy nanowires. DW motion controlled by current is a key function for the magnetic racetrack memory proposed by Stuart Parkin. The domain walls are pinned in constrictions defined by a triangularly shaped notch in one edge of the wires. The high sensitivity of the Hall sensors to local stray fields allows non-invasive detection of individual DWs pinned at spezific locations in a nanowire [1, 2]. We determined the dependence of the depinning fields on parameters such as current-pulse length and current density by injecting nanosecond current pulses at temperatures below 2 K. The reduction of the depinning fields is commonly explained due to spin-torque interaction. Hall micromagnetometry allows to investigate DW depinning with a high capability to acquire enough statistics.

P. Lendecke, R. Eiselt, G. Meier and U. Merkt, J. Appl. Phys. 103, 073909 (2008)
P. Lendecke et al., JMMM, in press (2009)