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Spin Vortex Resonance in Non-planar Ferromagnetic Dots.

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Altering ferromagnetic dot topography changes magnetic vortex dynamics, unlike planar structures. This study reveals distinct vortex gyration regimes in non-planar dots due to core confinement effects.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Magnetism

Background:

  • In planar ferromagnetic structures, vortex resonance frequency is largely insensitive to in-plane magnetic fields while the vortex state is stable.
  • Element topography significantly influences dynamic magnetic response, primarily due to local vortex core confinement.

Purpose of the Study:

  • To investigate magnetic excitations in non-planar ferromagnetic dots.
  • To understand the effect of topography on vortex dynamics and resonance frequencies.

Main Methods:

  • Utilized broadband microwave spectroscopy to probe magnetic excitations.
  • Employed micromagnetic simulations for theoretical comparison and validation.

Main Results:

  • Identified two distinct regimes of vortex gyration in non-planar ferromagnetic dots.
  • Observed that vortex core position dictates the observed dynamic behavior.
  • Experimental findings showed qualitative agreement with micromagnetic simulation results.

Conclusions:

  • Non-planar topography introduces significant changes in magnetic vortex dynamics compared to planar elements.
  • Vortex core confinement in non-planar structures leads to distinct, position-dependent gyration regimes.
  • The study validates the role of topography in controlling magnetic excitations in nanostructures.