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MA: Fachverband Magnetismus
MA 26: Thin films – coupling effects
MA 26.8: Vortrag
Mittwoch, 14. März 2018, 11:30–11:45, EB 301
Preparation and Characterization of Granular Magnetic Exchange Coupled Nano-Composites — •Runbang Shao1, Benjamin Riedmüller1, Balati Kuerbanjiang1, Ulrich Herr1, Adrian Schillik2, and Berndt Koslowski2 — 1Institut für Mikro- und Nanomaterialien, Universität Ulm, Ulm, Deutschland — 2Institut für Festkörperphysik, Universität Ulm, Ulm, Deutschland
Granular magnetic exchange coupled nano-composites have potentials in further increasing the storage density of hard disk drives, and producing permanent magnets with high energy product (BH)max. These nano-composites of nano-particles (NPs) embedded in or covered by thin films were produced, using a combination of inert gas condensation (IGC) and sputter deposition, in which variable material combinations could be selected. The sizes and volume filling factor (VFF) of the NPs could be controlled independently. SEM, especially in transmission mode (T-SEM) was used to measure the NP sizes. In case of superparamagnetic NPs, we compared these results to the magnetic particle sizes obtained by fitting the m-H curve to a superposition of Langevin functions. For blocked NPs embedded in antiferromagnetic films, a dependence of exchange bias (Hex) and coercivity (Hc) on the ferromagnetic NP VFF was observed. We also studied the magnetisation of individual NPs by the means of MFM.