Influence of geometry on domain wall dynamics in Permalloy nanodevices

Hector Corte-Leon, Anthony Beguivin, Patryk Krzysteczko, Hans Werner Schumacher, Alessandra Manzin, Russell P. Cowburn, Vladimir Antonov, Olga Kazakova

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

We perform magnetoresistance (MR) and magneto-optical Kerr effect (MOKE) measurements to experimentally track magnetic domain wall (DW) pinning/depinning process in L-shaped Permalloy nanostructures of different geometries (i.e., square/round corner and absence/presence of circular disks) with widths in the range 75-400 nm. With MR and MOKE measurements being in a good quantitative agreement, we demonstrate that the field interval between pinning and depinning events increases with reduction of the nanowire width. In addition, the DW pinning/depinning behavior is geometry dependent, where round corners break the symmetry in the device orientation with respect to the field. The interpretation of experimental results is supported by micromagnetic simulations.

Original languageEnglish
Article number7029184
JournalIEEE Transactions on Magnetics
Volume51
Issue number1
DOIs
Publication statusPublished - 1 Jan 2015
Externally publishedYes

Keywords

  • Magnetic domain walls (DWs)
  • magnetic sensors
  • micromagnetics
  • nanostructures
  • numerical simulations.

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