Journal
NANO LETTERS
Volume 20, Issue 4, Pages 2468-2477Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.9b05206
Keywords
SrRuO3; epitaxial thin films; anomalous Hall effect; Berry curvature; inhomogeneity
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Funding
- National Key R&D Program of China [2017YFA0402903, 2016YFA0401003]
- National Natural Science Foundation of China [51627901, U1932216]
- Maintenance and Renovation Project for CAS Major Scientific and Technological infrastructure [DSS-WXGZ-2019-0011]
- Hefei Science Centre CAS [2018HSC-UE014]
- National Center for Inter-University Research Facilities (NCIRF) at Seoul National University in Korea
- Research Center Program of IBS (Institute for Basic Science) in Korea [IBS-R009-D1]
- National Research Foundation of Korea [IBS-R009-D1-2020-A00] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In quantum matters hosting electron-electron correlation and spin-orbit coupling, spatial inhomogeneities, arising from competing ground states, can be essential for understanding exotic topological properties. A prominent example is Hall anomalies observed in SrRuO3 films, which were interpreted in terms of either magnetic skyrmion-induced topological Hall effect or inhomogeneous anomalous Hall effect (AHE). To clarify this ambiguity, we systematically investigated the evolution of AHE with controllable inhomogeneities in SrRuO3 film thickness (t(SRO)). By exploiting the step-flow growth of SrRuO3 films, we induced a microscopically ordered stripe pattern with one-unit-cell differences in t(SRO). The associated spatial distribution of momentum-space Berry curvatures enables a two-channel AHE with hump-like Hall anomalies, which can be continuously engineered according to non-integer t(SRO). We further microscopically characterized the stripe-like ferromagnetic domains and two-step magnetic switching behavior in the inhomogeneous SrRuO3 film. These unique features can be utilized to identify the two-channel AHE model and understand its microscopic origin.
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