Regensburg 2013 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 27: Thin Film Characterization: Structure Analysis and Composition (XRD, TEM, XPS, SIMS, RBS,...) I

DS 27.8: Vortrag

Mittwoch, 13. März 2013, 19:00–19:15, H32

Sol-Gel Type Ga_2−xFe_xO₃ Thin Films: Towards Room Temperature Magnetic Oxides with an Ordered Mesoporous Morphology and Nanocrystalline Wall Structure — •Christian Reitz, Christian Suchomski, Robert Kruk, and Torsten Brezesinski — Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), 76344 Eggenstein-Leopoldshafen

Both ferri(o)magnetism and ferroelectricity are indispensable in modern technologies and have been used in devices for quite some time. To further increase the performance, the materials employed need to be reduced to the nanometer scale. The same principle also pertains to multiferroics, showing coupling of both magnetic and electric order parameters. Such materials hold great promise for many applications. Among the few single-phase multiferroics that have been discovered to date, Ga_2−xFe_xO₃ (GFO) has recently been receiving increasing attention. In this work we focus on ordered large-pore mesoporous GFO thin films with nanocrystalline walls. These materials were produced through facile polymer templating strategies and served as model systems to obtain a better understanding of the relationships between nanoscale structure and ferroic properties. Electron microscopy, GISAXS, XPS, Raman spectroscopy and magnetization and Mössbauer studies confirmed the high-quality of the sol-gel derived thin films with ferrimagnetic ordering at room temperature and provided insight into the underlying coupling phenomena. At this point, it is envisioned that the pore cavities will facilitate the fabrication of novel magnetically exchange-coupled composites.