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Switching the Magnetic Vortex Core in a Single Nanoparticle.

Elena Pinilla-Cienfuegos1, Samuel Mañas-Valero1, Alicia Forment-Aliaga1

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Summary
This summary is machine-generated.

Researchers observed magnetic vortex formation and annihilation in 25 nm nanoparticles. The vortex core switching in these magnetic nanoparticles can be induced by very small magnetic fields.

Keywords:
low temperaturemagnetic force microscopymagnetic vorticesmagnetization switchingnanoparticles

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Nanotechnology

Background:

  • Magnetic vortices are crucial spin textures in nanomagnetism, enabling multibit storage.
  • Previous studies focused on micrometer-sized magnetic platelets for vortex studies.
  • Understanding vortex dynamics in smaller systems is key for advanced magnetic storage.

Purpose of the Study:

  • To experimentally observe vortex state formation and annihilation in individual 25 nm molecular-based magnetic nanoparticles.
  • To investigate the magnetization reversal mechanisms in these nanoscale magnetic systems.
  • To determine the magnetic field required for vortex core switching in these nanoparticles.

Main Methods:

  • Low-temperature variable-field magnetic force microscopy (LT-VF-MFM) was used for imaging.
  • Individual 25 nm molecular-based magnetic nanoparticles were studied.
  • Magnetic field was systematically varied to observe spin structure changes.

Main Results:

  • The formation and annihilation of vortex states were successfully observed in individual 25 nm nanoparticles.
  • The switching of the vortex core was induced by very small applied static magnetic fields.
  • This demonstrates the feasibility of manipulating spin textures in nanoscale magnetic systems.

Conclusions:

  • 25 nm molecular-based magnetic nanoparticles exhibit vortex spin textures.
  • Vortex core switching in these nanoparticles is achievable with low magnetic fields.
  • These findings pave the way for novel multibit magnetic storage media at the nanoscale.