Spin Valve Effect in all-oxide Superconductor/Ferromagnet Junctions

ORAL

Abstract

Due to their antagonistic properties, the interaction between ferromagnets and superconductors yields interesting behaviours such as the so-called superconducting spin valve effect. This is observed in junctions made of two ferromagnetic layers sandwiching a superconductor. The term spin-valve denotes the electrical resistance change observed upon switching the relative magnetizations in the ferromagnetic layers, from parallel to antiparallel alignment, by the application of magnetic field pulses. Here we demonstrate spin-valve effects in vertical junctions made of the d-wave superconductor YBa2Cu3O7 and a half-metal La0.7Ca0.3MnO3. Below the superconducting critical temperature, the junctions show a hysteretic magnetoresistance whose sign changes depending on the temperature and the injected current. These effects are discussed in terms of triplet Cooper pairs flow when the two ferromagnets are aligned.

*This work was supported by the ERC grant 647100 SUSPINTRONICS.

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Presenters

  • Aurélien LAGARRIGUE

    • CNRS/THALES

Authors

  • Aurélien LAGARRIGUE

    • CNRS/THALES

  • Salvatore Mesoraca

    • CNRS/THALES
    • Unité Mixte de Physique CNRS/Thales

  • David Sanchez

    • CNRS/THALES

  • Anke Sander

    • CNRS/THALES
    • Unité Mixte de Physique CNRS/Thales
    • Unité Mixte de Physique CNRS/Thales, Universite Paris-Saclay
    • Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767 Palaiseau, France
    • Unité Mixte de Physique, CNRS/Thales
    • Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767, Palaiseau, France

  • Javier Briatico

    • CNRS/THALES

  • Juan Trastoy

    • CNRS/THALES
    • Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767, Palaiseau, France

  • Jacobo Santamaria

    • Física de Materiales, GFMC, Universidad Complutense de Madrid
    • Universidad Complutense de Madrid
    • GFMC, Universidad Complutense de Madrid
    • Grupo de Física de Materiales Complejos, Dpt. Física de Materiales, Universidad Complutense de Madrid, 28040 Madrid, Spain
    • Física de Materiales, Universidad Complutense de Madrid

  • Javier E Villegas

    • CNRS/THALES
    • Unité Mixte de Physique CNRS/Thales
    • Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767 Palaiseau, France
    • Unité Mixte de Physique, CNRS/Thales
    • Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767, Palaiseau, France