Regensburg 2007 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 10: Layers with Magnetic Properties

DS 10.4: Vortrag

Montag, 26. März 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 Mader² — ¹Universität 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 1000^∘C 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.