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arXiv · 1911.08281

Imaging non-standing spin-waves in confined micron-sized ferromagnetic structures under uniform excitation

Santa Pile·Thomas Feggeler·Taddäus Schaffers·Ralf Meckenstock·Martin Buchner·Detlef Spoddig·Benjamin Zingsem·Verena Ney·Michael Farle·Heiko Wende·Hendrik Ohldag·Andreas Ney·Katharina Ollefs
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Abstract

A non-standing character of directly imaged spin-waves in confined micron-sized ultrathin permalloy (Ni\textsubscript{80}Fe\textsubscript{20}) structures is reported along with evidence of the possibility to alter the observed state by modifications to the sample geometry. Using micromagnetic simulations the presence of the spin-wave modes excited in the permalloy stripes along with the quasi-uniform modes were calculated. The predicted spin-waves were imaged in direct space using time resolved scanning transmission X-ray microscopy, combined with a ferromagnetic resonance excitation scheme (STXM-FMR). STXM-FMR measurements revealed a non-standing character of the spin-waves. Also it was shown by micromagnetic simulations and confirmed with STXM-FMR results that the observed character of the spin-waves can be influenced by the local magnetic fields in different sample geometries.

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Santa Pile, Thomas Feggeler, Taddäus Schaffers, Ralf Meckenstock, Martin Buchner, Detlef Spoddig, Benjamin Zingsem, Verena Ney, Michael Farle, Heiko Wende, Hendrik Ohldag, Andreas Ney, Katharina Ollefs. 2019-11-19. Imaging non-standing spin-waves in confined micron-sized ferromagnetic structures under uniform excitation. https://doi.org/10.1063/1.5139881

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