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      Electronic Inhomogeneity Influence on the Anomalous Hall Resistivity Loops of SrRuO 3 Epitaxially Interfaced with 5d Perovskites

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          Abstract

          SrRuO 3, a 4d ferromagnet with multiple Weyl nodes at the Fermi level, offers a rich playground to design epitaxial heterostructures and superlattices with fascinating magnetic and magnetotransport properties. Interfacing ultrathin SrRuO 3 layers with large spin–orbit coupling 5d transition-metal oxides, such as SrIrO 3, results in pronounced peaklike anomalies in the magnetic field dependence of the Hall resistivity. Such anomalies have been attributed either to the formation of Néel-type skyrmions or to modifications of the Berry curvature of the topologically nontrivial conduction bands near the Fermi level of SrRuO 3. Here, epitaxial multilayers based on SrRuO 3 interfaced with 5d perovskite oxides, such as SrIrO 3 and SrHfO 3, were studied. This work focuses on the magnetotransport properties of the multilayers, aiming to unravel the role played by the interfaces with 5d perovskites in the peaklike anomalies of the Hall resistance loops of SrRuO 3 layers. Interfacing with large band gap insulating SrHfO 3 layers did not influence the anomalous Hall resistance loops, while interfacing with the nominally paramagnetic semimetal SrIrO 3 resulted in pronounced peaklike anomalies, which have been lately attributed to a topological Hall effect contribution as a result of skyrmions. This interpretation is, however, under strong debate and lately alternative causes, such as inhomogeneity of the thickness and the electronic properties of the SrRuO 3 layers, have been considered. Aligned with these latter proposals, our findings reveal the central role played in the anomalies of the Hall resistivity loops by electronic inhomogeneity of SrRuO 3 layers due to the interfacing with semimetallic 5d 5 SrIrO 3.

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          Spin chirality, Berry phase, and anomalous Hall effect in a frustrated ferromagnet.

          An electron hopping on non-coplanar spin sites with spin chirality obtains a complex phase factor (Berry phase) in its quantum mechanical amplitude that acts as an internal magnetic field, and is predicted to manifest itself in the Hall effect when it is not cancelled. The present combined work of transport measurement, neutron scattering, and theoretical calculation provides evidence that the gigantic anomalous Hall effect observed in Nd2Mo2O7, a pyrochlore ferromagnet with geometrically frustrated lattice structure, is mostly due to the spin chirality and the associated Berry phase originating from the Mo spin tilting.
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            Additive interfacial chiral interaction in multilayers for stabilization of small individual skyrmions at room temperature

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              Hall Effect in Ferromagnetic Materials

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                Author and article information

                Journal
                ACS Omega
                ACS Omega
                ao
                acsodf
                ACS Omega
                American Chemical Society
                2470-1343
                10 March 2020
                24 March 2020
                : 5
                : 11
                : 5824-5833
                Affiliations
                []Institute of Physics II, University of Cologne , 50937 Cologne, Germany
                []Felix Bloch Institute for Solid State Physics, University of Leipzig , 04109 Leipzig, Germany
                [§ ]Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons, Forschungszentrum Jülich GmbH , 52425 Jülich, Germany
                []PGI-7, Forschungszentrum Jülich , 52428 Jülich, Germany
                []Institute of Electronic Materials (IWE2), RWTH Aachen University , 52062 Aachen, Germany
                [# ]Andrew & Erna Viterbi Department of Electrical Engineering, Technion—Israel Institute of Technology , 3200003 Haifa, Israel
                Author notes
                Article
                10.1021/acsomega.9b03996
                7097901
                31849b64-b1f0-4bd3-a72e-4608580b4848
                Copyright © 2020 American Chemical Society

                This is an open access article published under an ACS AuthorChoice License, which permits copying and redistribution of the article or any adaptations for non-commercial purposes.

                History
                : 24 November 2019
                : 05 February 2020
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