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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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Magnonic key based on skyrmion clusters.

E Saavedra1,2, F Tejo3, N Vidal-Silva4

  • 1Departamento de Física, Universidad de Santiago de Chile, Avda. Víctor Jara 3493, 9170124, Santiago, Chile.

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|November 27, 2021
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Summary
This summary is machine-generated.

We demonstrate exciting spin-wave modes in skyrmion clusters using magnetic field pulses. The number of skyrmions controls these modes, enabling potential magnonic logic devices.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Nanotechnology

Background:

  • Skyrmions are topologically protected magnetic quasiparticles with potential applications in data storage and logic.
  • Controlling spin-wave modes in magnetic nanostructures is crucial for developing advanced magnonic devices.

Purpose of the Study:

  • To investigate the excitation of spin-wave modes in skyrmion clusters within Co/Pt nanodots.
  • To explore the dependence of these modes on the number of skyrmions and the applied magnetic field direction.
  • To propose a skyrmion-based magnonic key for potential use in logic devices.

Main Methods:

  • Excitation of spin-wave modes using in-plane magnetic field pulses.
  • Stabilization of skyrmion clusters in Co/Pt nanodots.
  • Analysis of spin-wave modes in relation to skyrmion number and field direction.

Main Results:

  • Successfully excited five main spin-wave modes in skyrmion clusters.
  • Demonstrated that the excited modes are primarily azimuthal-like and strongly dependent on the skyrmion count.
  • Showcased the ability to activate and suppress specific spin-wave modes by controlling the skyrmion number.

Conclusions:

  • Skyrmion clusters in Co/Pt nanodots offer a tunable platform for controlling spin-wave modes.
  • The number of skyrmions acts as a switch to activate/suppress specific magnonic modes.
  • This research paves the way for developing novel magnonic logic devices utilizing skyrmionic textures.