Interfacial symmetry control of the chiral magnetism in iridate-manganite superlattices*

Correlated oxides have been extensively studied due to the diverse physical properties arising from strong 3d electron correlations combined with lattice and orbital degrees of freedom. Recently, progress toward the creation of exotic quantum and topological properties has been led by the synthesis of 5d oxides with strong spin-orbit coupling. We will present our recent work examining the physical properties of high-quality epitaxially grown LaMnO₃/SrIrO₃ superlattices. By creating large inversion symmetry breaking with different A- and B-sites in LaMnO₃/SrIrO₃, we obtain an “topological” Hall effect (THE) that results from interface-induced chiral magnetism resulting from interfacial Dzyaloshinskii-Moriya interactions (DMI). We explore the role of interface symmetry to drive the emergence of the THE at 3d/5d oxides by altering DMI at single interfaces. Furthermore, we compare the effects of (atomic) interfacial DMI and extended superlattice symmetry which together are responsible for the total effective DMI that drive the THE.