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Complex Three-Dimensional Magnetic Ordering in Segmented Nanowire Arrays.

Alexander J Grutter1, Kathryn L Krycka1, Elena V Tartakovskaya2,3

  • 1NIST Center for Neutron Research, National Institute of Standards and Technology , Gaithersburg, Maryland 20899, United States.

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|July 13, 2017
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Summary

Researchers visualized magnetic ordering in FeGa/Cu nanowires using polarized small-angle neutron scattering. The study reveals tunable spin structures dependent on field and geometry, offering insights for spintronic device design.

Keywords:
dipole interactionsgalfenolmagnetic couplingmagnetismnanowire arraypolarization analyzed small-angle neutron scatteringsegmented nanowires

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Understanding magnetic ordering in nanostructured materials is crucial for developing advanced electronic devices.
  • High-density arrays of magnetic nanowires exhibit complex spin structures influenced by competing magnetic interactions.

Purpose of the Study:

  • To experimentally determine the three-dimensional magnetic ordering in high-density arrays of segmented FeGa/Cu nanowires.
  • To investigate the influence of applied magnetic fields and sample geometry on the spin structure.
  • To provide a design roadmap for high-density magnetic nanowire arrays for spintronic applications.

Main Methods:

  • Application of polarized small-angle neutron scattering (PSANS) to achieve a comprehensive 3D picture of magnetic ordering.
  • Experimental characterization of magnetic interactions including dipolar interactions, shape anisotropy, and Zeeman energy.
  • Theoretical calculations to confirm experimental observations and explore stability windows of magnetic structures.

Main Results:

  • Observation of tunable spin structures stabilized by competing energetics, highly dependent on applied field and sample geometry.
  • Identification of both ferromagnetic and antiferromagnetic interactions among wires and between segments within individual wires.
  • Characterization of a low-field fan spin structure with antiparallel alignment between segments and a field-induced frustrated antiferromagnetic stripe pattern in the hexagonal lattice.

Conclusions:

  • The study successfully maps the complex magnetic ordering in FeGa/Cu nanowire arrays.
  • Competing magnetic interactions dictate the tunable spin structures, offering control over magnetic properties.
  • The findings provide critical insights for the rational design of magnetic nanowire arrays for future spintronic devices.