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Controllable positive exchange bias via redox-driven oxygen migration

Author

Listed:
  • Dustin A. Gilbert

    (University of California, Davis
    NIST Center for Neutron Research)

  • Justin Olamit

    (University of California, Davis)

  • Randy K. Dumas

    (University of California, Davis
    University of Gothenburg)

  • B. J. Kirby

    (NIST Center for Neutron Research)

  • Alexander J. Grutter

    (NIST Center for Neutron Research)

  • Brian B. Maranville

    (NIST Center for Neutron Research)

  • Elke Arenholz

    (Advanced Light Source, Lawrence Berkeley National Laboratory)

  • Julie A. Borchers

    (NIST Center for Neutron Research)

  • Kai Liu

    (University of California, Davis)

Abstract

Ionic transport in metal/oxide heterostructures offers a highly effective means to tailor material properties via modification of the interfacial characteristics. However, direct observation of ionic motion under buried interfaces and demonstration of its correlation with physical properties has been challenging. Using the strong oxygen affinity of gadolinium, we design a model system of GdxFe1−x/NiCoO bilayer films, where the oxygen migration is observed and manifested in a controlled positive exchange bias over a relatively small cooling field range. The exchange bias characteristics are shown to be the result of an interfacial layer of elemental nickel and cobalt, a few nanometres in thickness, whose moments are larger than expected from uncompensated NiCoO moments. This interface layer is attributed to a redox-driven oxygen migration from NiCoO to the gadolinium, during growth or soon after. These results demonstrate an effective path to tailoring the interfacial characteristics and interlayer exchange coupling in metal/oxide heterostructures.

Suggested Citation

  • Dustin A. Gilbert & Justin Olamit & Randy K. Dumas & B. J. Kirby & Alexander J. Grutter & Brian B. Maranville & Elke Arenholz & Julie A. Borchers & Kai Liu, 2016. "Controllable positive exchange bias via redox-driven oxygen migration," Nature Communications, Nature, vol. 7(1), pages 1-8, April.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms11050
    DOI: 10.1038/ncomms11050
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    Cited by:

    1. Gong Chen & Colin Ophus & Alberto Quintana & Heeyoung Kwon & Changyeon Won & Haifeng Ding & Yizheng Wu & Andreas K. Schmid & Kai Liu, 2022. "Reversible writing/deleting of magnetic skyrmions through hydrogen adsorption/desorption," Nature Communications, Nature, vol. 13(1), pages 1-8, December.

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