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

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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Cited by in corpus (5)

• Magnetic texture based magnonics
• Nonstanding spin waves in a single rectangular permalloy microstrip under uniform magnetic excitation
• Direct imaging of the ac component of the pumped spin polarization with element specificity
• Element-specific visualization of dynamic magnetic coupling in a Co/Py bilayer microstructure
• Quantifying the spin-wave asymmetry in single and double rectangular Ni${}_{80}$Fe${}_{20}$ microstrips by TR-STXM, FMR and micromagnetic simulations