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MA: Fachverband Magnetismus

MA 27: Complex Oxides: Surfaces and Interfaces (jointly with DS, HL, KFM, MA, O) (joint session TT/HL/MA)

MA 27.6: Vortrag

Dienstag, 17. März 2020, 15:15–15:30, HSZ 02

Crystalline anisotropy of magnetoresistance in LAO/STO nanostructures — •Mithun Sheena Prasad¹ and Georg Schmidt^1,2 — ¹.Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, Von-Danckelmann-Platz 3, D-06120 Halle, Germany — ²Interdisziplinäres Zentrum für Meterialwissenschaften, Martin-Luther-Universität Halle-Wittenberg, Heinrich-Damerow-Straße 4, D-06120 Halle, Germany

The high-mobility two-dimensional electron gas (2DEG) confined at the interface LaAlO₃ (LAO) and SrTiO₃ (STO) provides new opportunities to explore Nano electronic devices. In our group we have developed an industry compatible Nano patterning technique [1] for the LAO/STO interface. Recent studies on this interface have revealed that at low temperature the current is confined to filaments which are linked to structural domain walls in the STO with drastic consequences for example for the temperature dependence of local transport properties. We have investigated magneto-transport in nanostructures having different orientation with respect to the lattice. Our experiments show that not only the resistance but also the magnetoresistance varies with orientation. The magnetoresistance can even change sign for different orientations and again this can change after a warm-up cool-down cycle strongly supporting the model of filamentary charge transport.

[1] M. Z. Minhas, H. H. Blaschek, F. Heyroth, and G. Schmidt, AIP Advances 6, 035002 (2016)