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Multi-domain structures in spheroidal Co nanoparticles.

N A Usov1,2, M S Nesmeyanov3

  • 1National University of Science and Technology «MISiS», 119049, Moscow, Russia. usov@obninsk.ru.

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This study numerically simulated micromagnetic states in cobalt nanoparticles, revealing complex vortex structures in multi-domain configurations. Findings detail how particle size and shape influence magnetic states and remanent magnetization.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Understanding micromagnetic states in magnetic nanoparticles is crucial for developing advanced magnetic storage and spintronic devices.
  • Cobalt nanoparticles, particularly hexagonal close-packed (hcp) and face-centered cubic (fcc) structures, exhibit complex magnetic behaviors influenced by size, shape, and crystal anisotropy.

Purpose of the Study:

  • To investigate the micromagnetic state structures in spheroidal hcp cobalt nanoparticles.
  • To determine the single-domain diameters as a function of particle aspect ratio.
  • To analyze the vortex structure of domain walls in two- and three-domain configurations and their impact on remanent magnetization.

Main Methods:

  • Numerical simulations were employed to model micromagnetic states in hcp cobalt nanoparticles with diameters ranging from 20 to 200 nm.
  • Calculations included determining single-domain diameters based on aspect ratio and analyzing domain wall structures.
  • Remanent magnetization was computed for various multi-domain states.

Main Results:

  • The study identified complex vortex structures within domain walls of two- and three-domain micromagnetic configurations.
  • Three-domain states were characterized as deformed two-vortex states, with two distinct types found in larger hcp cobalt particles.
  • These distinct three-domain states possess similar total energies but differ in the magnetization direction of their vortex core.

Conclusions:

  • The aspect ratio significantly influences the single-domain diameter of hcp cobalt nanoparticles.
  • Three-domain states in cobalt nanoparticles are complex, deformed vortex structures with implications for magnetic properties.
  • Calculated remanent magnetization provides insights into the magnetic behavior of these nanoparticles for potential applications.