Spatially-resolved dynamic sampling of different phasic magnetic resonances of nanoparticle ensembles in a magnetotactic bacterium Magnetospirillum magnetotacticum

Nanoscaled magnetic particle ensembles are promising building blocks for realizing magnon based binary logic. Element-specific real-space monitoring of magnetic resonance modes with sampling rates in the GHz regime is imperative for the experimental verification of future complex magnonic devices. H...

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Bibliographic Details
Published in:New journal of physics 2023-04, Vol.25 (4), p.43010
Main Authors: Feggeler, Thomas, Lill, Johanna, Günzing, Damian, Meckenstock, Ralf, Spoddig, Detlef, Efremova, Maria V, Wintz, Sebastian, Weigand, Markus, Zingsem, Benjamin W, Farle, Michael, Wende, Heiko, Ollefs, Katharina J, Ohldag, Hendrik
Format: Article
Language:English
Subjects:
Bacteria
different phasic excitation
element specificity
Energy
ferromagnetic resonance
Iron oxides
Magnetic resonance
magnetotactic bacteria
Magnons
micromagnetic simulation
nanoparticle chain
Nanoparticles
Physics
Sampling
Scanning electron microscopy
Simulation
time-resolved scanning transmission x-ray microscopy
X ray absorption
X ray microscopy
X-rays
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Summary:Nanoscaled magnetic particle ensembles are promising building blocks for realizing magnon based binary logic. Element-specific real-space monitoring of magnetic resonance modes with sampling rates in the GHz regime is imperative for the experimental verification of future complex magnonic devices. Here we present the observation of different phasic magnetic resonance modes using the element-specific technique of time-resolved scanning transmission x-ray microscopy within a chain of dipolarly coupled Fe 3 O 4 nanoparticles (40–50 nm particle size) inside a single cell of a magnetotactic bacterium Magnetospirillum magnetotacticum . The particles are probed with 25 nm resolution at the Fe L 3 x-ray absorption edge in response to a microwave excitation of 4.07 GHz. A plethora of resonance modes is observed within multiple particle segments oscillating in- and out-of-phase, well resembled by micromagnetic simulations.
ISSN:1367-2630
1367-2630
DOI:10.1088/1367-2630/acc81f