Stability of 2π domain walls in ferromagnetic nanorings

Gabriel D. Chaves-O'Flynn, Daniel Bedau, Eric Vanden Eijnden, Andrew D. Kent, Daniel L. Stein

Research output: Contribution to journalArticle

Abstract

The stability of 2π domain walls in ferromagnetic nanorings is investigated via calculation of the minimum energy path that separates a 2π domain wall from the vortex state of a ferromagnetic nanoring. Trapped domains are stable when they exist between certain types of transverse domain walls, i.e., walls in which the edge defects on the same side of the magnetic strip have equal sign and thus repel. Here the energy barriers between these configurations and vortex magnetization states are obtained using the string method. Due to the geometry of a ring, two types of 2π walls must be distinguished that differ by their overall topological index and exchange energy. The minimum energy path corresponds to the expulsion of a vortex. The energy barrier for annihilation of a 2π wall is compared to the activation energy for transitions between the two ring vortex states.

Original languageEnglish (US)
Article number5467366
Pages (from-to)2272-2274
Number of pages3
JournalIEEE Transactions on Magnetics
Volume46
Issue number6
DOIs
StatePublished - Jun 2010

Fingerprint

Nanorings
Domain walls
Vortex flow
Energy barriers
Magnetization
Activation energy
Defects
Geometry

Keywords

  • Magnetic devices
  • Magnetization processes
  • Magnetization reversal

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials

Cite this

Chaves-O'Flynn, G. D., Bedau, D., Vanden Eijnden, E., Kent, A. D., & Stein, D. L. (2010). Stability of 2π domain walls in ferromagnetic nanorings. IEEE Transactions on Magnetics, 46(6), 2272-2274. [5467366]. https://doi.org/10.1109/TMAG.2010.2045484

Stability of 2π domain walls in ferromagnetic nanorings. / Chaves-O'Flynn, Gabriel D.; Bedau, Daniel; Vanden Eijnden, Eric; Kent, Andrew D.; Stein, Daniel L.

In: IEEE Transactions on Magnetics, Vol. 46, No. 6, 5467366, 06.2010, p. 2272-2274.

Research output: Contribution to journalArticle

Chaves-O'Flynn, GD, Bedau, D, Vanden Eijnden, E, Kent, AD & Stein, DL 2010, 'Stability of 2π domain walls in ferromagnetic nanorings', IEEE Transactions on Magnetics, vol. 46, no. 6, 5467366, pp. 2272-2274. https://doi.org/10.1109/TMAG.2010.2045484
Chaves-O'Flynn, Gabriel D. ; Bedau, Daniel ; Vanden Eijnden, Eric ; Kent, Andrew D. ; Stein, Daniel L. / Stability of 2π domain walls in ferromagnetic nanorings. In: IEEE Transactions on Magnetics. 2010 ; Vol. 46, No. 6. pp. 2272-2274.
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