Regensburg 2013 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 50: Poster II

MA 50.36: Poster

Freitag, 15. März 2013, 10:30–13:30, Poster D

Domain wall magnetoresistance and depinning in La_0.66Sr_0.33MnO₃ nanowires — Michael Foerster¹, Luis Peña¹, •Simone Finizio¹, Laurence Mechin², Felix Büttner^1,3, André Bisig⁴, Stefan Eisebitt³, and Mathias Kläui¹ — ¹Institut für Physik, Johannes Gutenberg Universität, Mainz, Germany — ²GREYC, UMR 6072, CNRS-ENSICAEN-UCBN, Caen Cedex, France — ³Institut für Optik und Atomare Physik, Technische Universität Berlin, Berlin, Germany — ⁴SwissFEL, Paul Scherrer Institut, Villigen PSI, Switzerland

Magnetic domain walls (DWs) and their reliable displacements are key ingredients for novel magnetic memory and sensing devices with switching by domain wall motion. La_0.66Sr_0.33MnO₃ (LSMO) is a ferromagnetic metal with a high spin polarization, which promises large spin transfer torque (STT) effects, and a T_c close to room temperature (370K) that allows for the investigation of magnetotransport and STT effects with tuneable parameters. We have measured the magnetoresistance of LSMO nanostructures at 4.3K, observing the magnetoresistance associated with DWs in an LSMO wire by comparing hysteresis loops with fields along different directions. Depinning of DWs was observed as function of the applied magnetic field along the wire, with good quantitative agreement with simulations. The injection of current pulses leads to changes in the signal that are probably due to local changes in the magnetization, which occur due to Joule heating combined with the low T_c.