• Medientyp: E-Artikel
  • Titel: Spatially resolved GHz magnetization dynamics of a magnetite nano-particle chain inside a magnetotactic bacterium
  • Beteiligte: Feggeler, Thomas [Verfasser:in]; Meckenstock, Ralf [Verfasser:in]; Spoddig, Detlef [Verfasser:in]; Zingsem, Benjamin [Verfasser:in]; Ohldag, Hendrik [Verfasser:in]; Wende, Heiko [Verfasser:in]; Farle, Michael [Verfasser:in]; Winklhofer, Michael [Verfasser:in]; Ollefs, Katharina J. [Verfasser:in]
  • Erschienen: APS, 2021
  • Erschienen in: Physical review research 3(3), 033036 (2021). doi:10.1103/PhysRevResearch.3.033036
  • Sprache: Englisch
  • DOI: https://doi.org/10.1103/PhysRevResearch.3.033036
  • ISSN: 2643-1564
  • Entstehung:
  • Anmerkungen: Diese Datenquelle enthält auch Bestandsnachweise, die nicht zu einem Volltext führen.
  • Beschreibung: Understanding magnonic properties of nonperiodic magnetic nanostructures requires real-space imaging of ferromagnetic resonance modes with spatial resolution well below the optical diffraction limit and sampling rates in the 5–100 GHz range. Here, we demonstrate element-specific scanning transmission x-ray microscopy-detected ferromagnetic resonance (STXM-FMR) applied to a chain of dipolarly coupled Fe3O4 nano-particles (40–50 nm particle size) inside a single cell of a magnetotactic bacterium Magnetospirillum magnetotacticum. The ferromagnetic resonance mode of the nano-particle chain driven at 6.748 GHz and probed with 50 nm x-ray focus size was found to have a uniform phase response but non-uniform amplitude response along the chain segments due to the superposition of dipolar coupled modes of chain segments and individual particles, in agreement with micromagnetic simulations.
  • Zugangsstatus: Freier Zugang