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Multisegmented Nanowires: a Step towards the Control of the Domain Wall Configuration.

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Multisegmented cobalt-nickel/nickel nanowires exhibit tunable magnetic domain configurations. Researchers can control these magnetic structures by balancing energies, offering potential for advanced magnetic devices.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Controlled electrodeposition enables synthesis of cylindrical nanowires for engineering magnetic domain configurations.
  • Multisegmented CoNi/Ni nanowires are designed to achieve specific periodic magnetic structures.

Purpose of the Study:

  • To synthesize multisegmented CoNi/Ni nanowires.
  • To tailor periodic magnetic structures by balancing magnetocrystalline and magnetostatic energies.
  • To investigate the magnetic configurations of CoNi and Ni segments.

Main Methods:

  • High-resolution Transmission Electron Microscopy (HR-TEM) for structural analysis.
  • Magnetic Force Microscopy (MFM) for imaging magnetic configurations.
  • Micromagnetic simulations for interpreting magnetic behavior.

Main Results:

  • HR-TEM confirmed segmented growth and sharp interfaces in CoNi/Ni nanowires.
  • Ni segments showed single-domain axial magnetization.
  • CoNi segments displayed single vortex or complex multivortex states, influenced by competing anisotropies.
  • MFM under in-plane magnetic field showed switching from multivortex to single vortex states.

Conclusions:

  • The atypical monocrystalline fcc structure of CoNi segments balances magnetocrystalline and shape anisotropies.
  • Tunable magnetic configurations in CoNi/Ni nanowires can be achieved through controlled synthesis.
  • Switching magnetic states with low magnetic fields demonstrates potential for magnetic device applications.