Berlin 2024 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 7: Bulk Magnetic Materials and Magnetic Particles/Clusters
MA 7.11: Vortrag
Montag, 18. März 2024, 12:15–12:30, EB 407
Dynamic magnetic responses inside Magnetite nanoparticle chains detected by Scanning Transmission X-Ray Microscopy Ferromagnetic Resonance — Thomas Feggeler1,2, Johanna Lill1, Damian Günzing1, Ralf Meckenstock1, Detlef Spoddig1, Sebastian Wintz3, Markus Weigand3, Benjamin Zingsem1, Heiko Wende1, Michael Farle1, Hendrik Ohldag2, and •Katharina Ollefs1 — 1Faculty of Physics and CENIDE, Duisburg, Germany — 2Advanced Light Source, LBNL, Berkeley, United States of America — 3Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin, Germany
Magnonic excitation of a nanoparticle chain of Magnetite particles (diameter of about 50 nm) embedded in a bacterium Magnetospirillum Magnetotacticum is measured using Scanning Transmission X-Ray Microscopy detected Ferromagnetic Resonance (TR-STXM) [1]. TR-STXM-FMR features the element specific detection of magnetization dynamics with a spatial resolution < 50 nm and a time resolution in the ps regime. A resonant response of the segments of the nanoparticle chain is identified and confirmed by micromagnetic simulations. The manipulation of the external applied magnetic field further allows to selectively excite different segments inside the nanoparticle chains demonstrating the feasibility of magnonic logic devices [2]. We acknowledge funding from DFG via project OL513/1-1, 321560838 and CRC TRR HoMMage.
[1] Th. Feggeler, et al., Phys. Rev. Res. 3, 033036 (2021).
[2] Th. Feggeler et al. New J. Phys. 25 043010 (2023).
Keywords: magnon; ferromagnetic resonance; magnetic bacteria; x-ray imaging