Dresden 2006 – wissenschaftliches Programm

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MA: Magnetismus

MA 20: Poster: Films(1-36) Transp(37-56) Ex.Bias(57-67) Spindyn(68-80) Micromag(81-95) Particle(96-109) Imag.+Surface(110-113) Spinelectr(114-122) Theory+Micromag(123-131) Spinstr+Aniso(132-142) MagMat(143-156) Meas(157,158) MolMag+Kondo(159-162) Postdead(163-)

MA 20.48: Poster

Dienstag, 28. März 2006, 15:15–19:15, P1

Scanning probe microscopy on manganite thin films — •S. A. Köster, L. Sudheendra, V. Moshnyaga, B. Damaschke, and K. Samwer — I. Physikalisches Institut, Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen

Doped manganites show the colossal magnetoresistance effect (CMR). The main effect is observed in high magnetic fields in the vicinity of the metal insulator transition temperature. According to the percolation model of Dagotto et al.[1] two different phases, an insulating and conducting one, exist in parallel. We prepared our thin films on MgO substrates by Metallorganic aerosol deposition (MAD) , while the films turned out to be perfectly epitaxial. In our work we can show by scanning tunneling spectroscopy, that low resistivity and high resistivity regions do exist in the samples and that these are changed with applied magnetic fields. Our investigations concentrate on achieving a more detailed picture of these phases and their origin on a microscopic scale. The dependency on several parameters like the microstructure of the samples, temperature or magnetic fields can be observed.

[1] E. Dagotto, T. Hotta, A. Moreo, Physics Reports 344, (2001)

Acknowledgement: This work was supported by DFG within SFB602, TP A2.