TY  - JOUR
AU  - Feggeler, Thomas
AU  - Meckenstock, Ralf
AU  - Spoddig, Detlef
AU  - Zingsem, Benjamin
AU  - Ohldag, Hendrik
AU  - Wende, Heiko
AU  - Farle, Michael
AU  - Winklhofer, Michael
AU  - Ollefs, Katharina J.
TI  - Spatially resolved GHz magnetization dynamics of a magnetite nano-particle chain inside a magnetotactic bacterium
JO  - Physical review research
VL  - 3
IS  - 3
SN  - 2643-1564
CY  - College Park, MD
PB  - APS
M1  - FZJ-2022-00188
SP  - 033036
PY  - 2021
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000671591900004
DO  - DOI:10.1103/PhysRevResearch.3.033036
UR  - https://juser.fz-juelich.de/record/904872
ER  -