  Investigating the effects of the complex magnetic interactions on the
formation of nontrivial magnetic phases enables a better understanding of
magnetic materials. Moreover, an effective method to systematically control
those interactions and phases could be extensively utilized in spintronic
devices. SrRuO3 heterostructures function as a suitable material system to
investigate the complex magnetic interactions and the resultant formation of
topological magnetic phases, as the heterostructuring approach provides an
accessible controllability to modulate the magnetic interactions. In this
study, we have observed that the Hall effect of SrRuO3/SrTiO3 superlattices
varies nonmonotonically with the repetition number (z). Using Monte Carlo
simulations, we identify a possible origin of this experimental observation:
the interplay between the Dzyaloshinskii-Moriya interaction and dipole-dipole
interaction, which have differing z-dependence, might result in a z-dependent
modulation of topological magnetic phases. This approach provides not only a
collective understanding of the magnetic interactions in artificial
heterostructures but also a facile control over the skyrmion phases.
