Blog
About

  • Record: found
  • Abstract: found
  • Article: found
Is Open Access

Proximity effects across oxide-interfaces of superconductor-insulator-ferromagnet hybrid heterostructure

Read this article at

Bookmark
      There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

      Abstract

      A case study of electron tunneling or charge-transfer-driven orbital ordering in superconductor (SC)-ferromagnet (FM) interfaces has been conducted in heteroepitaxial YBa2Cu3O7(YBCO)/La0.67Sr0.33MnO3(LSMO) multilayers interleaved with and without an insulating SrTiO3(STO) layer between YBCO and LSMO. X-ray magnetic circular dichroism experiments revealed anti-parallel alignment of Mn magnetic moments and induced Cu magnetic moments in a YBCO/LSMO multilayer. As compared to an isolated LSMO layer, the YBCO/LSMO multilayer displayed a (50%) weaker Mn magnetic signal, which is related to the usual proximity effect. It was a surprise that a similar proximity effect was also observed in a YBCO/STO/LSMO multilayer, however, the Mn signal was reduced by 20%. This reduced magnetic moment of Mn was further verified by depth sensitive polarized neutron reflectivity. Electron energy loss spectroscopy experiment showed the evidence of Ti magnetic polarization at the interfaces of the YBCO/STO/LSMO multilayer. This crossover magnetization is due to a transfer of interface electrons that migrate from Ti(4+)−δ to Mn at the STO/LSMO interface and to Cu2+ at the STO/YBCO interface, with hybridization via O 2p orbitals. So charge-transfer driven orbital ordering is the mechanism responsible for the observed proximity effect and Mn-Cu anti-parallel coupling in YBCO/STO/LSMO. This work provides an effective pathway in understanding the aspect of long range proximity effect and consequent orbital degeneracy parameter in magnetic coupling.

      Related collections

      Most cited references 32

      • Record: found
      • Abstract: found
      • Article: not found

      Superconducting interfaces between insulating oxides.

      At interfaces between complex oxides, electronic systems with unusual electronic properties can be generated. We report on superconductivity in the electron gas formed at the interface between two insulating dielectric perovskite oxides, LaAlO3 and SrTiO3. The behavior of the electron gas is that of a two-dimensional superconductor, confined to a thin sheet at the interface. The superconducting transition temperature of congruent with 200 millikelvin provides a strict upper limit to the thickness of the superconducting layer of congruent with 10 nanometers.
        Bookmark
        • Record: found
        • Abstract: found
        • Article: not found

        Multiferroic BaTiO3-CoFe2O4 Nanostructures.

        We report on the coupling between ferroelectric and magnetic order parameters in a nanostructured BaTiO3-CoFe2O4 ferroelectromagnet. This facilitates the interconversion of energies stored in electric and magnetic fields and plays an important role in many devices, including transducers, field sensors, etc. Such nanostructures were deposited on single-crystal SrTiO3 (001) substrates by pulsed laser deposition from a single Ba-Ti-Co-Fe-oxide target. The films are epitaxial in-plane as well as out-of-plane with self-assembled hexagonal arrays of CoFe2O4 nanopillars embedded in a BaTiO3 matrix. The CoFe2O4 nanopillars have uniform size and average spacing of 20 to 30 nanometers. Temperature-dependent magnetic measurements illustrate the coupling between the two order parameters, which is manifested as a change in magnetization at the ferroelectric Curie temperature. Thermodynamic analyses show that the magnetoelectric coupling in such a nanostructure can be understood on the basis of the strong elastic interactions between the two phases.
          Bookmark
          • Record: found
          • Abstract: found
          • Article: not found

          Controlled injection of spin-triplet supercurrents into a strong ferromagnet.

          The superconductor-ferromagnet proximity effect describes the fast decay of a spin-singlet supercurrent originating from the superconductor upon entering the neighboring ferromagnet. After placing a conical magnet (holmium) at the interface between the two, we detected a long-ranged supercurrent in the ferromagnetic layer. The long-range effect required particular thicknesses of the spiral magnetically ordered holmium, consistent with spin-triplet proximity theory. This enabled control of the electron pairing symmetry by tuning the degree of magnetic inhomogeneity through the thicknesses of the holmium injectors.
            Bookmark

            Author and article information

            Affiliations
            [1 ]ISNI 0000 0001 0674 4228, GRID grid.418304.a, Technical Physics Division, , Bhabha Atomic Research Centre, ; Mumbai, 400085 India
            [2 ]ISNI 0000 0001 0674 4228, GRID grid.418304.a, Solid State Physics Division, , Bhabha Atomic Research Centre, ; Mumbai, 400085 India
            [3 ]ISNI 0000 0004 1775 9822, GRID grid.450257.1, Homi Bhabha National Institute, ; Anushaktinagar, Mumbai, 400085 India
            [4 ]ISNI 0000 0001 2297 375X, GRID grid.8385.6, Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), , Forschungszentrum Jülich GmbH, ; Lichtenbergstraße 1, D-85747 Garching b. München, Germany
            [5 ]ISNI 0000 0001 0668 7243, GRID grid.266093.8, Irvine Materials Research Institute, , University of California, ; Irvine, CA 92697-2800 USA
            [6 ]Technische Universität München, Physik Department E21, Lehrstuhl für Neutronenstreuung, James-Franck-Straße 1, D-85748 Garching, Germany
            Contributors
            ORCID: http://orcid.org/0000-0002-6202-5081, amitesh.paul@tum.de
            Journal
            Sci Rep
            Sci Rep
            Scientific Reports
            Nature Publishing Group UK (London )
            2045-2322
            27 February 2018
            27 February 2018
            2018
            : 8
            5829237
            22036
            10.1038/s41598-018-22036-y
            © The Author(s) 2018

            Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

            Categories
            Article
            Custom metadata
            © The Author(s) 2018

            Uncategorized

            Comments

            Comment on this article