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Schematic illustrations of the vortex nucleation processes in a triangle nanomagnet from the uniformly magnetized states with (a) and (b) . Solid and dotted arrows indicate the directions of magnetization with magnetic field and without magnetic field, respectively.
Vortex chiralities formed in (a) triangle and (b) pentagonal nanomagnet as a function of the direction of the initial magnetization obtained by the micromagnetic simulations.
MFM images of virgin state (left) and remanent states after the application of the magnetic field of 80 mT along 0 (center: remanent state A) and (right: remanent state B) in the triangle, square, and pentagonal nanomagnets together with the simulated MFM images obtained from the micromagnetic simulations.
MFM images of (a) heptagonal and (b) nonagonal nanomagnets at remanent state A initialized by the magnetic field along and remanent state B initialized by the magnetic field along .
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