Size effects in ordered arrays of magnetic nanotubes: Pick your reversal mode

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Autor/in:
Erscheinungsjahr:
2009
Medientyp:
Text
Schlagworte:
  • Nanowires
  • Electrodeposition
  • Alumina templates
  • Magnetic Anisotropy
  • Magnetization
  • Magnetism
  • Nanowires
  • Electrodeposition
  • Alumina templates
  • Magnetic Anisotropy
  • Magnetization
  • Magnetism
Beschreibung:
  • Ordered arrays of magnetic nanotubes are prepared by combining a porous template (anodic alumina) with a self-limiting gas-solid chemical reaction (atomic layer deposition). The geometric parameters can thus be tuned accurately (tube length of 1-50 μm, diameter of 20-150 nm, and wall thickness of 1-40 nm), which enables one to systematically study how confinement and anisotropy effects affect the magnetic properties. In particular, the wall thickness of such ordered Fe3 O4 nanotubes has a nonmonotonic influence on their coercive field. Theoretical models reproduce the size effects that are experimentally observed and interpret them as originating from a crossover between two distinct modes of magnetization reversal. © 2009 American Institute of Physics.
Lizenz:
  • info:eu-repo/semantics/closedAccess
Quellsystem:
Forschungsinformationssystem der UHH
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Quelldatensatz
oai:www.edit.fis.uni-hamburg.de:publications/b33ef6ab-5540-4a4b-a74c-9e66a2937da8