Berlin 2012 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 19: Poster I: Multiferroics (jointly with MA, DF, KR, TT), Spins in organic materials (jointly with MA), FePt Nanoparticles (jointly with MA, MM)
DS 19.8: Poster
Dienstag, 27. März 2012, 12:15–15:15, Poster A
Interaction effects between self-assembled Co nanoparticles — •Astrid Ebbing1, Leonardo Agudo2, Gunther Eggeler2, and Oleg Petracic1 — 1Institut für Experimentalphysik/Festkörperphysik, Ruhr-Universität Bochum, 44780 Bochum — 2Institut für Werkstoffe, Ruhr-Universität Bochum, 44780 Bochum
In this work we present the influence of Pt on self-assembled Co nanoparticles (NPs). We show that capping the Co NPs with Pt results in strong changes in the magnetic properties. With increasing Pt capping we observe a transition from ’demagnetizing’ (viz. dipolar) toward ’magnetizing’ (e.g. polarization type) interactions between the NPs. We performed magnetization hysteresis, ZFC/FC vs. temperature and delta(M)-measurements using a superconducting quantum interference device magnetometer to investigate the nature of coupling between the NPs. The measurements show negative delta(M)-values for small amounts of Pt capping material and positive values for 0.53 nm Pt or more, which indicates a magnetizing interaction between the NPs via the Pt-bridges.