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Asymmetric energy potential of pinned domain walls at constrictions
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) AFM image showing the nanowire geometry; (b) MFM image of a CW vortex wall; (c) MFM image of a CCW vortex wall; (d) spin distribution of a CW vortex wall obtained numerically; (e) calculated MFM image from a simulated CW vortex; and (f) CCW vortex. The constriction depth is 60 nm. The same scale applies for [(a)–(f)]. All vortex walls are of HH type.

Image of FIG. 2.
FIG. 2.

Energy potential profiles for HH CW and TT CCW vortex walls, trapped at a pinning site, in wires for different geometrical depths of the constriction. The displacement is measured in the direction. An external field is applied in the direction with a step size of 0.5 mT. The equilibrium positions were chosen so that the energy difference between two graphs is a multiple of 4 aJ.

Image of FIG. 3.
FIG. 3.

The propagation field for HH vortex walls trapped in wires with . Experimental values (triangles) for positive and negative fields are compared with simulations (squares) for CW and CCW chiralities.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Asymmetric energy potential of pinned domain walls at constrictions