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Emergent Topological Hall Effect in La₀.₇Sr₀.₃MnO₃/SrIrO₃ Heterostructures

Li, Yao, Zhang, Lunyong, Zhang, Qinghua, Li, Chen, Yang, Tieying, Deng, Yu, Gu, Lin, Wu, Di
ACS applied materials & interfaces 2019 v.11 no.23 pp. 21268-21274
ferromagnetism, oxides, temperature, texture, topology
Recently, perovskite oxide heterostructures have drawn great attention because multiple and complex coupling at the heterointerface may produce novel magnetic and electric phenomena that are not expected in homogeneous materials either in the bulk or in films. In this work, we report for the first time that an emergent giant topological Hall effect (THE), associated with a noncoplanar (NC) spin texture, can be induced in ferromagnetic (FM) La₀.₇Sr₀.₃MnO₃ thin films in a wide temperature range of up to 200 K by constructing La₀.₇Sr₀.₃MnO₃/SrIrO₃ epitaxial heterostructures on (001) SrTiO₃ substrates. This THE is not observed in La₀.₇Sr₀.₃MnO₃ single-layer films or La₀.₇Sr₀.₃MnO₃/SrTiO₃/SrIrO₃ trilayer heterostructures, indicating the relevance of the La₀.₇Sr₀.₃MnO₃/SrIrO₃ interface, where the Dzyaloshinskii–Moriya interaction due to strong spin–orbital coupling in SrIrO₃ may play a crucial role. The fictitious field associated with THE is independent of temperature in La₀.₇Sr₀.₃MnO₃/SrIrO₃ heterostructures, suggesting that the NC spin texture may be magnetic skyrmions. This work demonstrates the feasibility of using SrIrO₃ to generate novel magnetic and transport characteristics by interfacing with other correlated oxides, which might be useful to novel spintronic applications.