Domain wall transformations and hopping in La 0.7 Sr 0.3 MnO 3 nanostructures imaged with high resolution x-ray magnetic microscopy

S Finizio (1) , M Foerster (2, 1) , B Kruger (1) , C. A. Vaz (1, 3) , T Miyawaki (4) , M. Mawass (1, 5) , L Peña (1) , Laurence Méchin (6) , Sebastian Huhn (7) , V Moshnyaga (7) , Félix Buttner (1, 8) , A Bisig (5, 1, 3) , L Le Guyader (9) , S. El Moussaoui (9) , S Valencia (10) , F Kronast (10) , S Eisebitt (8, 10) , M Kläui (1)

1 Institut für Physik [Mainz]
2 ALBA Synchrotron light source [Barcelone]
3 Swiss FEL [Villigen]
4 Nagoya University
5 Max Planck Institute for Intelligent Systems [Tübingen]
6 Equipe Electronique - Laboratoire GREYC - UMR6072
7 Georg-August-University = Georg-August-Universität Göttingen
8 Institut fur Optik und Atomare Physik
9 SLS-PSI - The Swiss Light Source (SLS)
10 HZB - Helmholtz-Zentrum Berlin für Materialien und Energie GmbH = Helmholtz Centre Berlin for Materials and Energy = Centre Helmholtz de Berlin pour les matériaux et l'énergie

We investigate the effect of electric current pulse injection on domain walls in La 0.7 Sr 0.3 MnO 3 (LSMO) half-ring nanostructures by high resolution x-ray magnetic microscopy at room temperature. Due to the easily accessible Curie temperature of LSMO, we can employ reasonable current densities to induce the Joule heating necessary to observe effects such as hopping of the domain walls between different pinning sites and nucleation/annihilation events. Such effects are the dominant features close to the Curie temperature, while spin torque is found to play a small role close to room temperature. We are also able to observe thermally activated domain wall transformations and we find that, for the analyzed geometries, the vortex domain wall configuration is energetically favored, in agreement with micromagnetic simulations.

Mots clés: x-ray microscopy; current induced domain wall motion; LSMO

Domaines: Electronique

S Finizio, M Foerster, B Kruger, C. A. Vaz, T Miyawaki, et al.. Domain wall transformations and hopping in La 0.7 Sr 0.3 MnO 3 nanostructures imaged with high resolution x-ray magnetic microscopy. Journal of Physics: Condensed Matter, 2014, 6 p. ⟨hal-01194536⟩