Berlin 2018 – scientific programme
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MA: Fachverband Magnetismus
MA 21: Poster I
MA 21.35: Poster
Tuesday, March 13, 2018, 09:30–13:00, Poster A
Magnon Bandstructure of strongly dipolar-coupled nanoparticle chains — •Benjamin Zingsem1,2, Thomas Feggeler1, Alexandra Terwey1, Sara Ghaisari3, Detlef Spoddig2, Damien Faivre3, Ralf Meckenstock1, Michael Farle1, and Michael Winklhofer4 — 1Faculty of Physics, University of Duisburg-Essen, 47057 Duisburg, Germany. — 2Ernst Ruska Centre for Microscopy and Spectroscopy with Electrons and Peter Grünberg Institute, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany — 3Department of Biomaterials, Max Planck Institute of Colloids and Interfaces, Potsdam, Germany — 4School of Mathematics and Science, University of Oldenburg, 26129 Oldenburg, Germany.
We present Ferromagnetic Resonance (FMR) spectroscopy on individual chains of magnetic nanoparticles. The chains consist of 10-20 magnetite crystals with a crystal size of about 30 nm. Our measurements reveal intriguing properties regarding the formation of magnonic band gaps, as well as an unusual curvature of angular dependent resonance lines. We show that through modification of the geometric arrangement of these particles, i.e. by introducing defects or kinks, the magnonic properties of these chains can be tailored, yielding potential applications for nano-sized magnon-logic and spintronic devices. In addition to the measurements, we performed high performance GPU accelerated micromagnetic simulations, which provide further insight into the unusual magnon band structure. These simulations are in good agreement with the measured spectra and allow us to identify the connection between spatial and spectral features.