PuSH - Publication Server of Helmholtz Zentrum München: Spatially-resolved dynamic sampling of different phasic magnetic resonances of nanoparticle ensembles in a magnetotactic bacterium <em>Magnetospirillum magnetotacticum</em>.

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Feggeler, T.* ; Lill, J.* ; Günzing, D.* ; Meckenstock, R.U.* ; Spoddig, D.* ; Efremova, M.V. ; Wintz, S.* ; Weigand, M.* ; Zingsem, B.W.* ; Farle, M.* ; Wende, H.* ; Ollefs, K.J.* ; Ohldag, H.*

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

New J. Phys. 25:043010 (2023)

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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 Fe3O4 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 L3 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.

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Publication type Article: Journal article

Document type Scientific Article

Corresponding Author

Keywords Different Phasic Excitation ; Element Specificity ; Ferromagnetic Resonance ; Magnetotactic Bacteria ; Micromagnetic Simulation ; Nanoparticle Chain ; Time-resolved Scanning Transmission X-ray Microscopy; Aquaspirillum-magnetotacticum; Sp-nov

e-ISSN 1367-2630

Journal New Journal of Physics

Quellenangaben Volume: 25, Issue: 4, Article Number: 043010

Publisher Institute of Physics Publishing (IOP)

Publishing Place Temple Circus, Temple Way, Bristol Bs1 6be, England

Non-patent literature Publications

Reviewing status Peer reviewed

Institute(s) Insitute of Synthetic Biomedicine (ISBM)

Grants Add-on Fellowship for Interdisciplinary Life Science by the Joachim Herz Foundation
Alexander von Humboldt Research Fellowship for Postdoctoral Researchers
Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)
LDRD Award: Development of a Continuous Photon Counting Scheme for Time Resolved Studies
Lawrence Berkeley National Laboratory
Advanced Light Source, a U.S. DOE Office of Science User Facility