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Element-specific visualization of dynamic magnetic coupling in a Co/Py bilayer microstructure.

Thomas Feggeler1,2, Ralf Meckenstock3, Detlef Spoddig3

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We visualized magnetic excitations in Permalloy (Py) and Cobalt (Co) bilayers using scanning transmission X-ray microscopy. Angular momentum transfer between Py and Co was observed, revealing insights into magnetic exchange interactions.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Ferromagnetic resonance (FMR) is crucial for understanding magnetic dynamics.
  • Characterizing coupled magnetic systems requires element-specific analysis.
  • Previous studies lacked time-resolved, spatially resolved visualization of coupled magnetic excitations.

Purpose of the Study:

  • To visualize element-specific, time-resolved ferromagnetic resonance (FMR) excitations in a Permalloy (Py) disk-Cobalt (Co) stripe bilayer.
  • To investigate the dynamics of magnetization precession and angular momentum transfer between Py and Co.
  • To elucidate the origin of an unexpected third resonance observed in the bilayer system.

Main Methods:

  • Utilized a combination of ferromagnetic resonance (FMR) and scanning transmission X-ray microscopy (STXM-FMR).
  • Achieved picosecond (ps) time resolution and nanometer spatial resolution.
  • Recorded snapshots of local magnetization precession for individual elements (Py and Co).

Main Results:

  • Demonstrated element-specific imaging of magnetization precession dynamics.
  • Observed bidirectional angular momentum transfer between the Py disk and Co stripe at their respective resonances.
  • Identified an unexpected third resonance in the integral FMR spectrum and STXM-FMR experiments.

Conclusions:

  • The study provides unprecedented visualization of coupled magnetic dynamics in a Py/Co bilayer.
  • Magnetic exchange coupling between Py and Co is identified as the governing mechanism for the third resonance.
  • Stray field influence on the Co stripe results in a phase difference in magnetization precession.