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Regensburg 2007 – scientific programme

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DS: Fachverband Dünne Schichten

DS 10: Layers with Magnetic Properties

DS 10.4: Talk

Monday, March 26, 2007, 18:00–18:15, H34

Multilayered Polycrystalline Iron Garnet Structure of Bi3Fe5O12 and Y3Fe5O12 grown on SiO2 substrates by pulsed laser deposition — •Timo Körner1, Andreas Heinrich1, Stephan Leitenmeier1, Michael Herbort1, Bernd Stritzker1, Jürgen Simon2, and Werner Mader21Universität Augsburg, EPIV, 86135 Augsburg — 2Universität Bonn, Institut für Anorganische Chemie, 53117 Bonn

Iron Garnet single crystals like Y3Fe5O12 (YIG) are important ceramic systems with extensive applications in structural ceramics and opto-electronics. Currently, it is desirable to integrate such macroscopic components on a single chip (e.g. Si, SiO2, …) as in the case of microelectronics (integrated optics). High quality magnetooptical (MO) active garnet films with high Faraday rotation are also needed for MO imaging and microscopy. In our work we studied the influence of parameters during the deposition of YIG films and developed a new way to grow polycrystalline Bi3Fe5O12 (BIG) thin films on different SiO2 substrates using the pulsed laser deposition (PLD) method. Therefore we deposited a YIG buffer which was annealed above 1000C in order to form a polycrystalline phase. On top of this buffer layer we deposited a thermodynamical unstable BIG layer. We measured the Faraday rotation of the films and studied them with x-ray diffraction (XRD), Rutherford backscattering spectroscopy (RBS), Environmental Scanning Electron Microscopy (ESEM) and high-resolution transmission electron spectroscopy (HRTEM). Their Faraday rotation can be compared with epitaxial BIG films grown on garnet substrates.

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