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I16-Materials and Magnetism	Stable humplike Hall effect and noncoplanar spin textures in SrRuO 3 ultrathin films Byungmin Sohn , Bongju Kim , Se Young Park , Hwan Young Choi , Jae Young Moon , Taeyang Choi , Young Jai Choi , Hua Zhou , Jun Woo Choi , Alessandro Bombardi , Dan. G. Porter , Seo Hyoung Chang , Jung Hoon Han , Changyoung Kim Physical Review Research 3 DOI: 10.1103/PhysRevResearch.3.023232 Diamond Proposal Number(s): [22181] Open Access Show Abstract ▼ Abstract: We observed a humplike feature in Hall effects of SrRuO 3 ultrathin films, and systematically investigated it by controlling thicknesses, temperatures and magnetic fields. The humplike feature is extremely stable, even surviving as a magnetic field is tilted by as much as 85 ∘ . Based on the atomic-level structural analysis of a SrRuO 3 ultrathin film with a theoretical calculation, we reveal that atomic rumplings at the thin-film surface enhance Dzyaloshinskii-Moriya interaction, which can generate stable chiral spin textures and a humplike Hall effect. Moreover, temperature dependent resonant x-ray measurements at the Ru L edge under a magnetic field showed that the intensity modulation of unexpected peaks was correlated with the hump region in the Hall effect. We verify that the two-dimensional property of ultrathin films generates stable noncoplanar spin textures having a magnetic order in a ferromagnetic oxide material.	Jun 2021

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