Regensburg 2010 – scientific programme

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MA: Fachverband Magnetismus

MA 19: Magnetic Half-metals and Oxides II

MA 19.3: Talk

Wednesday, March 24, 2010, 15:45–16:00, H22

Switching on the Nanoscale on La_0.7Ca_0.3MnO₃Thin Films — •Jon-Olaf Krisponeit, Christin Kalkert, Bernd Damaschke, Vasily Moshnyaga, and Konrad Samwer — I. Physikalisches Institut, Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen

Perowskite manganites are known to show a variety of resistance effects, including not only temperature-driven metal to insulator transitions but also the colossal magneto resistive effect (CMR).

Here, we have examined a La_0.7Ca_0.3MnO₃ thin film prepared by the metalorganic aerosol deposition technique. The resistance behavior was studied not only macroscopically but also on the nanoscale. Topography and current images have been recorded with an atomic force microscope (AFM) using a tip with conductive coating. Local I-V-characteristics have been taken.

We observed repeatable switching of individual nano-scaled regions that is reversible by applying a voltage of the opposite polarity. Our results clearly show a threshold voltage as well as a dependance on pulse duration. The results are discussed in terms of oxygen drift versus local structural changes.

Acknowledgement: The work is supported by DFG via SFB 602, TP A2 and the Leibniz program.