Domain wall propagation in Permalloy nanowires with a thickness gradient

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Erscheinungsjahr:
2009
Medientyp:
Text
Schlagworte:
  • Domain walls
  • Magnetization reversal
  • Nanofabrication
  • Nanowires
Beschreibung:
  • The magnetization reversal behavior of Permalloy nanowires has been investigated using a magneto-optic Kerr effect setup. Nanowires with various widths, w = 250 nm to 3 μm and a thickness of t = 10 nm were fabricated by electron-beam lithography and subsequent lift-off. Furthermore, similar nanowires but with a thickness gradient along the nanowire axis have been prepared to investigate the influence of the gradient on the magnetic domain wall propagation. Magnetization hysteresis loops recorded on individual nanowires without a gradient are compared to corresponding wires with a thickness gradient. The dependence of the coercive field, Hc vs. t / w shows a linear behavior for wires without a gradient. However, wires with a gradient display a more complex crossover behavior. We find a plateau in the Hc vs. t / w curve at values of w, where a transformation from transverse to vortex domain wall type is expected. © 2009 Elsevier Ltd. All rights reserved.
Lizenz:
  • info:eu-repo/semantics/closedAccess
Quellsystem:
Forschungsinformationssystem der UHH
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oai:www.edit.fis.uni-hamburg.de:publications/30c1ebf2-add4-4b5a-9ed8-5492b998ef8b