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Extracting the Dynamic Magnetic Contrast in Time-Resolved X-Ray Transmission Microscopy

Using a time-resolved detection scheme in scanning transmission X-ray microscopy (STXM), we measured element resolved ferromagnetic resonance (FMR) at microwave frequencies up to 10 GHz and a spatial resolution down to 20 nm at two different synchrotrons. We present different methods to separate the...

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Detalles Bibliográficos
Autores principales: 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
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6669469/
https://www.ncbi.nlm.nih.gov/pubmed/31261780
http://dx.doi.org/10.3390/nano9070940
Descripción
Sumario:Using a time-resolved detection scheme in scanning transmission X-ray microscopy (STXM), we measured element resolved ferromagnetic resonance (FMR) at microwave frequencies up to 10 GHz and a spatial resolution down to 20 nm at two different synchrotrons. We present different methods to separate the contribution of the background from the dynamic magnetic contrast based on the X-ray magnetic circular dichroism (XMCD) effect. The relative phase between the GHz microwave excitation and the X-ray pulses generated by the synchrotron, as well as the opening angle of the precession at FMR can be quantified. A detailed analysis for homogeneous and inhomogeneous magnetic excitations demonstrates that the dynamic contrast indeed behaves as the usual XMCD effect. The dynamic magnetic contrast in time-resolved STXM has the potential be a powerful tool to study the linear and nonlinear, magnetic excitations in magnetic micro- and nano-structures with unique spatial-temporal resolution in combination with element selectivity.