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MA: Fachverband Magnetismus

MA 21: Poster I

MA 21.86: Poster

Dienstag, 13. März 2018, 09:30–13:00, Poster A

Synthesis and study of magnetic nanoparticle systems of iron oxide, cobalt and their mixtures — •Svetlana Klimova, Nadine Fokin, Inga Ennen, Daniela Ramermann, and Andreas Hütten — Bielefeld University, Bielefeld, Germany

Magnetic nanoparticles (NPs) have potential for various applications such as sensors, ferro*uidics, high-frequency electronics, high performance permanent magnets, magnetic refrigerants, and catalytic systems. For producing and using magnetic NPs there are three key issues, which dominate the magnetic properties of magnetic NPs and their ensembles: *nite size effects, surface effects, interparticle interactions. Reducing the size leads to quantum con*nement and modi*es the properties at the nanoscale. Exchange bias like hysteresis shifts can be observed in ferromagnetic NPs, in which the surface behaves like a spin glass, which is formed due to *nite-size and surface effects. Furthermore, surface effects are related to the symmetry breaking of the crystal structure at the boundary of each magnetic NP. This work focuses on the synthesis of systems of iron oxide, cobalt and NP mixtures of different sizes and different magnetic phases. Comparing structural with magnetic characterization will reveal the magnetic interactions. Moreover, the resulting magnetic transport properties will be presented and discussed.