Elementspezifische Untersuchung von Spindynamik in Nano- und Heterostrukturen mit ultimativer Ortsauflösung
Zusammenfassung der Projektergebnisse
In summary, we successfully measured element-specifically the dynamic magnetic properties of individual magnetic micro- and nano-ensembles showcasing complex magnetic environments utilizing the novel experimental approach of STXM-FMR, jointly developed by the applicants and the beamline staff of the Stanford Synchrotron Radiation Laboratory (SSRL). Combined with a newly developed pixelwise sinosoidal fit analysis of the STXM-FMR datasets, inhomogeneities in the excitation (amplitude and phase) of the magnetization could be revealed and analyzed in great detail. Our STXM-FMR measurements allowed to visualize edge resonance modes, excited due to additional resonance conditions caused by stray fields, overlapping the expected standing spin wave modes inside of the confined structure of Permalloy stripes. Dynamic magnetic coupling was element-specifically visualized in a microstructured bilayer sample consisting of a Py disc with a Co stripe on top revealing an exchanged coupled mode in addition to the expected two main ferromagnetic resonances, typically explained in the scope of in-phase and out-of-phase optical or acoustical modes. The concept of biomagnonic computing was illustrated by our joint investigations of the tailorability of magnonic dispersion by differently shaped magnetite nanoparticle chains inside magnetotactic bacteria. As a proof of this concept, the first spatially resolved dynamic measurement of a resonant response of a magnetite nanoparticle chain inside a magnetotactic bacterium magnetospirillum magnetotacticum was recorded, revealing a resonant response inhomogeneous in amplitude with uniform phase distribution.
Projektbezogene Publikationen (Auswahl)
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The combination of micro-resonators with spatially resolved ferromagnetic resonance. Review of Scientific Instruments, 88(9).
Schaffers, T.; Meckenstock, R.; Spoddig, D.; Feggeler, T.; Ollefs, K.; Schöppner, C.; Bonetti, S.; Ohldag, H.; Farle, M. & Ney, A.
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Biologically encoded magnonics. Nature Communications, 10(1).
Zingsem, Benjamin W.; Feggeler, Thomas; Terwey, Alexandra; Ghaisari, Sara; Spoddig, Detlef; Faivre, Damien; Meckenstock, Ralf; Farle, Michael & Winklhofer, Michael
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Extracting the Dynamic Magnetic Contrast in Time-Resolved X-Ray Transmission Microscopy. Nanomaterials, 9(7), 940.
Schaffers, Taddäus; Feggeler, Thomas; Pile, Santa; Meckenstock, Ralf; Buchner, Martin; Spoddig, Detlef; Ney, Verena; Farle, Michael; Wende, Heiko; Wintz, Sebastian; Weigand, Markus; Ohldag, Hendrik; Ollefs, Katharina & Ney, Andreas
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Non-standing spin-waves in confined micrometer-sized ferromagnetic structures under uniform excitation. Applied Physics Letters, 116(7).
Pile, S.; Feggeler, T.; Schaffers, T.; Meckenstock, R.; Buchner, M.; Spoddig, D.; Zingsem, B.; Ney, V.; Farle, M.; Wende, H.; Ohldag, H.; Ney, A. & Ollefs, K.
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Spatially resolved GHz magnetization dynamics of a magnetite nano-particle chain inside a magnetotactic bacterium. Physical Review Research, 3(3).
Feggeler, Thomas; Meckenstock, Ralf; Spoddig, Detlef; Zingsem, Benjamin W.; Ohldag, Hendrik; Wende, Heiko; Farle, Michael; Winklhofer, Michael & Ollefs, Katharina J.
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Element-specific visualization of dynamic magnetic coupling in a Co/Py bilayer microstructure. Scientific Reports, 12(1).
Feggeler, Thomas; Meckenstock, Ralf; Spoddig, Detlef; Schöppner, Christian; Zingsem, Benjamin; Schaffers, Taddäus; Ohldag, Hendrik; Wende, Heiko; Farle, Michael; Ney, Andreas & Ollefs, Katharina
