title: Interface-driven topological Hall effect in SrRuO3-SrIrO3 bilayer.
abstract: Electron transport coupled with magnetism has attracted attention over the years. Among them, recently discovered is topological Hall effect (THE), originating from scalar spin chirality, that is, the solid angle subtended by the spins. THE is found to be a promising tool for probing the Dzyaloshinskii-Moriya (DM) interaction and consequent magnetic skyrmions. This interaction arises from broken inversion symmetry and hence can be artificially introduced at interface; this concept is lately verified in metal multilayers. However, there are few attempts to investigate such DM interaction at interface through electron transport. We clarified how the transport properties couple with interface DM interaction by fabricating the epitaxial oxide interface. We observed THE in epitaxial bilayers consisting of ferromagnetic SrRuO3 and paramagnetic SrIrO3 over a wide region of both temperature and magnetic field. The magnitude of THE rapidly decreases with the thickness of SrRuO3, suggesting that the interface DM interaction plays a significant role. Such interaction is expected to realize a 10-nm-sized Néel-type magnetic skyrmion. The present results established that the high-quality oxide interface enables us to tune the effective DM interaction; this can be a step toward future topological electronics.
authors.affiliation: RIKEN Center for Emergent Matter Science (CEMS), Saitama 351-0198, Japan.
authors.forename: Jobu
authors.identifier: 0000-0002-3018-8548
authors.initials: J
authors.lastname: Matsuno
authors.affiliation: RIKEN Center for Emergent Matter Science (CEMS), Saitama 351-0198, Japan.
authors.forename: Naoki
authors.initials: N
authors.lastname: Ogawa
authors.affiliation: Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan.
authors.forename: Kenji
authors.initials: K
authors.lastname: Yasuda
authors.affiliation: RIKEN Center for Emergent Matter Science (CEMS), Saitama 351-0198, Japan.
authors.forename: Fumitaka
authors.identifier: 0000-0002-1763-6799
authors.initials: F
authors.lastname: Kagawa
authors.affiliation: RIKEN Center for Emergent Matter Science (CEMS), Saitama 351-0198, Japan.
authors.forename: Wataru
authors.initials: W
authors.lastname: Koshibae
authors.affiliation: RIKEN Center for Emergent Matter Science (CEMS), Saitama 351-0198, Japan.; Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan.
authors.forename: Naoto
authors.initials: N
authors.lastname: Nagaosa
authors.affiliation: RIKEN Center for Emergent Matter Science (CEMS), Saitama 351-0198, Japan.; Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan.
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Tokura
authors.affiliation: RIKEN Center for Emergent Matter Science (CEMS), Saitama 351-0198, Japan.; Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan.
authors.forename: Masashi
authors.initials: M
authors.lastname: Kawasaki
mesh_terms: D004579:Electron Transport; D060526:Magnetic Fields; D059346:Magnets; D017348:Microscopy, Electron, Scanning Transmission; D010087:Oxides / Q000737:chemistry*; D017975:Ruthenium Compounds / Q000737:chemistry*; D013324:Strontium / Q000737:chemistry*; D013696:Temperature
chemical_list: D010087:Oxides; D017975:Ruthenium Compounds; D013324:Strontium
keywords: Spin-orbit interaction; berry phase; broken inversion symmetry; dzyaloshinskii-Moriya interaction; magnetic skyrmion; spintronics; topological Hall effect