Fig. 3: Tailoring topological charge of magnetic skyrmionic structures via DMI engineering.
a–h Monte-Carlo simulations of skyrmionic structures with topological charge equals +1, 0, −1, −2 through DMI-reversal line crossing 0, 1, 2, 3 times, correspondingly. The DMI’s sign settings in the simulation are indicated by the light and dark in the derived Néel-chirality image. i Dependence of Q on the DMI-reversal line crossing n in Monte-Carlo simulations. j–q Derived Néel-chirality images overlapped with the morphology LEEM images and corresponding compound SPLEEM images of skyrmion (j, k), trivial bubble (l, m), antiskyrmion (n, o), and high-Q skyrmionic structure (p, q) in [2 ML Ni/1 ML Co]2/2 ML & 3 ML Pd/W(110). r Experimental statistics on the dependence of Q on the effective DMI-reversal line crossing neff. The numbers on the scatters indicate the number of events observed in the experiment for each case.
