Dresden 2009 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 23: Magnetic Thin Films II
MA 23.4: Vortrag
Mittwoch, 25. März 2009, 15:30–15:45, HSZ 04
Magnetic nanocomposite preparation, characterization and applications — •amit kulkarni1, vladimir zaporojtchenko1, ulrich schürmann2, lorenz kienle3, eckhard quandt2, and franz faupel1 — 1Chair for Multicomponent Materials, Faculty of Engineering, CAU Kiel, Germany — 2Chair for Inorganic Functional Materials, Faculty of Engineering, CAU Kiel , Germany — 3Synthesis and Real Structures, Faculty of Engineering, CAU Kiel, Germany
Hybrid materials consisting of metal nanoparticles dispersed in a dielectric matrix are the subject of extensive research due to their novel functional properties. The present talk is concerned with the preparation of oxide-based nanocomposites by vapor phase co- and tandem deposition and the resulting functional properties. The technique allows the preparation of nano-composites which contain alloy clusters of well defined composition with either a particulate or a multilayer nanostructure.
Thin multilayer films of tandem - sputtered TiO2 / SiO2 as dielectric and Fe54Ni27Co19 as ferromagnetic components with different layer thicknesses were prepared. Multilayer system shows a cut-off frequencies up to 3 GHz and HF-permeability above 100. A comparative study with polymer based composites will also be presented.
On other hand co-sputtering will lead to granular films. Structural and chemical analysis, by HRTEM, of TiO2 - FeCo shows that the surface of as-deposited film is completely amorphous, chemically and optically homogeneous. Composite films are superparamagnetic in nature with 5% TMR near to the percolation threshold.