[14p-2H-1~15] 6.3 Oxide electronics

[14p-2H-2] Interface-driven topological Hall effect in SrIrO₃-SrRuO₃ bilayer

〇Jobu Matsuno¹, Naoki Ogawa¹, Masashi Kawasaki^1,2, Yoshinori Tokura^1,2 (1.RIKEN CEMS, 2.Univ. of Tokyo)

Keywords:spin-orbit interaction,skyrmion,oxide interface

We have studied transport properties of bilayers consisting of m unit cells of SrRuO₃ and 2 unit cells of SrIrO₃. We observed an anomaly in the Hall resistivity, which can be attributed to topological Hall effect. The topological term rapidly decreases with m, ending up with a complete disappearance at m = 7. These results suggest that magnetic skyrmions of 10–20 nm are generated by Dzyaloshinskii-Moriya interaction, which might be caused by both broken inversion symmetry at the interface and strong spin-orbit coupling of SrIrO₃.