Dresden 2006 – wissenschaftliches Programm

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DF: Dielektrische Festkörper

DF 1: Internal Symposium “Integrated Electroceramic Functional Structures”

DF 1.3: Vortrag

Montag, 27. März 2006, 10:30–10:50, M{\"U}L Elch

Multifunctional materials on the basis of oxidic thin films — •Matthias Opel¹, Karl-Wilhelm Nielsen¹, Stephan Geprägs¹, Sebastian T.B. Goennenwein¹, Rudolf Gross¹, Wentao Yu², Jürgen Simon², and Werner Mader² — ¹Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, Walther-Meissner-Str. 8, 85748 Garching — ²Institut für Anorganische Chemie, Universität Bonn, Römerstr. 164, 53117 Bonn

Transition metal oxides can show very different properties, e.g. superconductivity, semiconductivity, ferromagnetism, and/or ferroelectricity. Due to the enormous progress in thin film deposition technology, these properties can be integrated in oxidic heterostructures, resulting in novel functionalities.

In this contribution, we discuss the state of the art in pulsed laser deposition for the growth of thin oxide films. Taking ferromagnetic materials such as Zn_1−xCo_xO, Sr₂CrWO₆, Fe₃O₄, and BiMO₃ (M = Fe, Cr) as an example, we report on the influence of strain and crystal orientation on the magnetic properties. We furthermore address multifunctional heterostructures consisting of ferromagnet/semiconductor multilayers, as well as the possibility to realize (multiferroic) ferromagnetic/ferroelectric multilayers. High-resolution transmission electron microscopy and electron energy loss spectroscopy give important insight into the role of defects and inhomogeneities in the layers and at the interfaces.