Dresden 2011 – scientific programme

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MA: Fachverband Magnetismus

MA 10: Magnetization Dynamics I

MA 10.4: Talk

Monday, March 14, 2011, 15:30–15:45, HSZ 403

Generation of Domain Walls by Local Magnetic Fields — •Falk-Ulrich Stein, Lars Bocklage, Michael Martens, Toru Matsuyama, and Guido Meier — Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung, Universität Hamburg, Germany

In recent years attention focussed on investigations of domain walls in nanowires for application in a racetrack memory [1]. While the field- and current-driven propagation of domain-walls along nanowires was the core theme in most cases [2,3], the study of domain-wall creation by local Oersted-fields has not been in focus. Mostly global fields are used to create domain walls. For devices such fields are improper because of their low efficiency, long time constants and overall impact on the magnetic structure. Our work investigates the creation of domain walls by local fields of a strip line. We present measurements of stochastic field-pulse induced domain-wall formation. From those results the strength and duration of the local fields are gained, which are required for the creation. The creation itself is investigated by micromagnetic simulations and by time-resolved measurements of the anisotropic magnetoresistance.

[1] S.S.P. Parkin, et al., Science 320, 190 (2008)

[2] G. Meier, et al., Phys. Rev. Lett. 98, 187202 (2007)

[3] L. Bocklage, et al., Phys. Rev. Lett. 103, 197204 (2009)