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The effect of geometrical confinement and chirality on domain wall pinning behavior in planar nanowires

Bogart, L.K.; Eastwood, D.S.; Atkinson, D.

The effect of geometrical confinement and chirality on domain wall pinning behavior in planar nanowires Thumbnail


Authors

L.K. Bogart

D.S. Eastwood



Abstract

We investigate the domain wall pinning behavior in Permalloynanowires using experimental measurements and micromagnetic simulations. Planar nanowirestructures were fabricated by electron beam lithography followed by thin-filmdeposition via thermal evaporation. The magnetization switching behavior of individual nanowires was measured using the magneto-optical Kerr effect. For symmetrical pinning structures such as the junction between a wider domain wall injection pad and a narrower nanowire, the domain wall depinning field increases as the wire width decreases, with the depinning field increasing rapidly for wires widths below 400 nm. For domain wall pinning at asymmetrical structures such as a notch, the magnitude of the depinning field appears relatively insensitive to notch geometry for triangular and rectangular notch structures, compared to the influence of the wire width. The domain wall depinning field from triangular notches increases as notch depth increases although this increase levels off at notch depths greater than approximately 60% wire width. The nature of domain wall pinning at asymmetrical notch structures is also sensitive to domain wallchirality.

Citation

Bogart, L., Eastwood, D., & Atkinson, D. (2008). The effect of geometrical confinement and chirality on domain wall pinning behavior in planar nanowires. Journal of Applied Physics, 104(3), https://doi.org/10.1063/1.2961313

Journal Article Type Article
Publication Date Aug 1, 2008
Deposit Date Feb 17, 2015
Publicly Available Date Feb 17, 2015
Journal Journal of Applied Physics
Print ISSN 0021-8979
Electronic ISSN 1089-7550
Publisher American Institute of Physics
Peer Reviewed Peer Reviewed
Volume 104
Issue 3
DOI https://doi.org/10.1063/1.2961313
Keywords Nanowires, Domain walls, Manetooptic Kerr effect, Chiral symmetries, Magnetic fields.
Public URL https://durham-repository.worktribe.com/output/1549164

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Copyright Statement
© 2008 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in J. Appl. Phys. 104, 033904 (2008) and may be found at http://dx.doi.org/10.1063/1.2961313






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