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Вид документа : Статья из журнала
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Автор(ы) : Feggeler, Thomas, Meckenstock, Ralf, Spoddig, Detlef, Zingsem, Benjamin W., Ohldag, Hendrik, Wende, Heiko, Farle M., Winklhofer, Michael, Ollefs, Katharina J.
Заглавие : Spatially resolved GHz magnetization dynamics of a magnetite nano-particle chain inside a magnetotactic bacterium
Коллективы : Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)German Research Foundation (DFG) [405553726 TRR 270, OL513/1-1, 321560838]; government of the Russian Federation [075-15-2019-1886]; US Department of Energy, Office of Science, Office of Basic Energy SciencesUnited States Department of Energy (DOE) [DE-AC02-76SF00515]
Место публикации : Phys. Rev. Research. - 2021. - Vol. 3, Is. 3. - Ст.033036. - ISSN 2643-1564(eISSN), DOI 10.1103/PhysRevResearch.3.033036
Примечания : Cited References: 40. - This work is funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) -Project No. OL513/1-1, 321560838, and in part by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) -Project-ID 405553726 TRR 270. M.F. acknowledges support by the government of the Russian Federation (agreement No. 075-15-2019-1886). We gratefully acknowledge A. Ney for fruitful discussions. The use of the Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, is supported by the US Department of Energy, Office of Science, Office of Basic Energy Sciences under Contract No. DE-AC02-76SF00515
Предметные рубрики: AQUASPIRILLUM-MAGNETOTACTICUM
ELECTRON-MICROSCOPY
SP-NOV
Аннотация: 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 microscopydetected 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.
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