%0 Journal Article
%A Feggeler, Thomas
%A Meckenstock, Ralf
%A Spoddig, Detlef
%A Zingsem, Benjamin
%A Ohldag, Hendrik
%A Wende, Heiko
%A Farle, Michael
%A Winklhofer, Michael
%A Ollefs, Katharina J.
%T Spatially resolved GHz magnetization dynamics of a magnetite nano-particle chain inside a magnetotactic bacterium
%J Physical review research
%V 3
%N 3
%@ 2643-1564
%C College Park, MD
%I APS
%M FZJ-2022-00188
%P 033036
%D 2021
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000671591900004
%R 10.1103/PhysRevResearch.3.033036
%U https://juser.fz-juelich.de/record/904872