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(A–D) Micromagnetic simulation of a Py disk with surrounding elliptical nanomagnets, as a function of nanomagnet position. The associated winding number of the nanomagnets is shown in top left. (A-C) An anti-vortex forms in the disk for values of (ϑmax) of 190°, 200°, and 210°. (D) Uniform magnetization observed for (ϑmax)=225°.
