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MA: Fachverband Magnetismus

MA 16: Poster I

MA 16.26: Poster

Dienstag, 12. März 2013, 10:30–13:30, Poster D

Current-induced domain wall motion at low current densities in La0.7Sr0.3MnO3 nanostructures imaged with high resolution x-ray magnetic microscopy — S. Finizio¹, M. Foerster¹, C. A. F. Vaz^1,2, F. Büttner^1,2,5, M. Mawass¹, •R. Lo Conte¹, T. Miyawaki³, A. Bisig², L. Méchin⁴, F. Nolting⁶, and M. Kläui¹ — ¹JGU, Mainz, Germany — ²SwissFEL, PSI, Villigen PSI, Switzerland — ³University of Nagoya, Nagoya, Japan — ⁴GREYC, UMR 6072, CNRS-ENSICAEN-UCBN, Caen Cedex, France — ⁵TU Berlin, Berlin, Germany — ⁶SLS, PSI, Villigen PSI, Switzerland

The effect of current pulses on the magnetization of nanometric La0.7Sr0.3MnO3 (LSMO)-half-rings has been investigated by high resolution x-ray magnetic microscopy. The potential high spin polarization and low room temperature saturation magnetization of LSMO make it a promising candidate for spin-torque-based technology applications. Here we investigate Current-Induced Domain Wall Motion (CIDWM) in LSMO nanostructures at low current densities (1-5x10 GA/m2). Their magnetic configuration was imaged by X-ray Magnetic Circular Dichroism - Photoemission Electron Microscopy (XMCD-PEEM). We observe mainly an initial single vortex wall and DW transformations, annihilation and nucleation after current injection due to the low Curie temperature (Tc ~ 340K) of our nanostructures. Low velocity (~0.5mm/s)DW displacements have been observed and interesting information on the energetics of the DW configurations has been obtained. While low current densities allow to move walls, the low Tc of LSMO limits the application for a CIDWM-based technology.