Regensburg 2010 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 9: Magnetic Particles, Clusters
MA 9.15: Vortrag
Montag, 22. März 2010, 19:00–19:15, H23
Magnetic and structural properties of TiO2 - FeCo nanocomposite — •Amit Kulkarni1, Vladimir Zaporojtchenko1, Thomas Stunkus1, Franz Faupel1, Eckhard Quandt2, Venkata sai kiran Chakravadhanula3, and Lorenz Kienle3 — 1Institute for Materials Science - Multicomponent Materials, Faculty of Engineering, Christian-Albrechts University at Kiel — 2Institute for Materials Science - Synthesis and Real Structures, Faculty of Engineering, Christian-Albrechts University at Kiel — 3Institute for Materials Science - Inorganic Functional Materials, Faculty of Engineering, Christian-Albrechts University at Kiel
Composite films of TiO2 as an insulator and FeCo as a ferromagnetic component with different metal volume fractions (MVF) were prepared by co-sputtering. High resolution transmission electron microscopy (HRTEM) analysis reveals that the microstructure of the TiO2/FeCo nanocomposites depends on the MVF. Amorphous nanocomposites are formed at lower MVF whereas FeCo crystallites are present at higher MVF. Likewise, the magnetic characteristics of these films depend on the MVF. At low MVF, composite films contain single domain particles exhibiting superparamagnetism whereas at high MVF FeCo forms percolating network of crystallites resulting in enlargement of the hysteresis loop. These composite films show a considerable tunnel magneto resistance of 5 % at RT and could be interesting as low cost magnetic field sensors.