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Updated: Nov 18, 2025

Fabrication of Magnetic Nanostructures on Silicon Nitride Membranes for Magnetic Vortex Studies Using Transmission Microscopy Techniques
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Spin-Wave Emission from Vortex Cores under Static Magnetic Bias Fields.

Sina Mayr1,2, Lukáš Flajšman3,4, Simone Finizio1

  • 1Paul Scherrer Institut, 5232 Villigen PSI, Switzerland.

Nano Letters
|February 5, 2021
PubMed
Summary

A static magnetic field shifts nanoscale spin wave emission from magnetic vortex cores toward the disk edge. This field also causes directional wave propagation in single-layer disks, confirmed by simulations.

Keywords:
X-ray microscopymagnetization dynamicsmagnonicsspin wavesvortex cores

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Nanotechnology

Background:

  • Spin waves are fundamental excitations in magnetic materials.
  • Magnetic vortex cores are promising for nanoscale spin-wave devices.
  • Controlling spin-wave emission is crucial for spintronic applications.

Purpose of the Study:

  • Investigate the effect of static magnetic fields on spin-wave emission from magnetic vortex cores.
  • Understand how magnetic bias fields influence spin-wave propagation characteristics.
  • Explore potential focusing effects in spin-wave emission.

Main Methods:

  • Time-resolved scanning transmission X-ray microscopy (TR-STXM) for imaging spin waves.
  • Utilized disk structures of synthetic ferrimagnets and single ferromagnetic layers.
  • Employed micromagnetic simulations to corroborate experimental findings.

Main Results:

  • Static magnetic bias fields continuously displace the vortex core from the disk center to the edge.
  • Spin-wave dispersion relations remain largely unaffected by the magnetic bias field.
  • Anisotropic core expansion in single-layer disks leads to directional spin-wave emission and propagation.
  • Micromagnetic simulations reveal field-controlled focusing effects.

Conclusions:

  • Static magnetic fields offer a method to control the location and directionality of spin-wave emission from vortex cores.
  • The findings are relevant for designing advanced spintronic devices.
  • Focusing effects can be tuned by magnetic fields, opening possibilities for wave manipulation.