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Head-to-Head Domain Wall Structures in Tapered Magnetic Strips | IEEE Journals & Magazine | IEEE Xplore
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Head-to-Head Domain Wall Structures in Tapered Magnetic Strips


Abstract:

We present the calculations of head-to-head domain wall (DW) structures in magnetic nanowires of permalloy and cobalt with a tapered cross section, with average widths, W...Show More

Abstract:

We present the calculations of head-to-head domain wall (DW) structures in magnetic nanowires of permalloy and cobalt with a tapered cross section, with average widths, Wmid, ranging from 60 to 300 nm, ratios of the bottom width, WBottom, to top width, WTop, ranging from 1 to 2 and thicknesses, T, from 7.5 to 15 nm. In agreement with prior work, for wires with a rectangular cross section, the critical thickness and wire width W which determines whether transverse or vortex DWs are energetically favored is approximated by T · W = C · δ2 with δ the exchange length and C a constant. When taking the slope of the tapered edge of the nanowires into account, the relation is modified by a slope-dependent term which is presented in this paper. The results provide an extended phase diagram for stable DW regimes. Furthermore, the effect of magnetocrystalline anisotropy energy is investigated which yields a more complex thickness and anisotropy energy-dependent behavior.
Published in: IEEE Transactions on Magnetics ( Volume: 53, Issue: 2, February 2017)
Article Sequence Number: 7100104
Date of Publication: 27 October 2016

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