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Electrostatically controlled spin polarization in Graphene-CrSBr magnetic proximity heterostructures

Author

Listed:
  • Boxuan Yang

    (University of Groningen)

  • Bibek Bhujel

    (University of Groningen)

  • Daniel G. Chica

    (Columbia University)

  • Evan J. Telford

    (Columbia University
    Columbia University)

  • Xavier Roy

    (Columbia University)

  • Fatima Ibrahim

    (Univ. Grenoble Alpes, CEA, CNRS, Spintec)

  • Mairbek Chshiev

    (Univ. Grenoble Alpes, CEA, CNRS, Spintec
    Institut Universitaire de France (IUF))

  • Maxen Cosset-Chéneau

    (University of Groningen)

  • Bart J. van Wees

    (University of Groningen)

Abstract

The magnetic proximity effect can induce a spin dependent exchange shift in the band structure of graphene. This produces a magnetization and a spin polarization of the electron/hole carriers in this material, paving the way for its use as an active component in spintronics devices. The electrostatic control of this spin polarization in graphene has however never been demonstrated so far. We show that interfacing graphene with the van der Waals antiferromagnet CrSBr results in an unconventional manifestation of the quantum Hall effect, which can be attributed to the presence of counterflowing spin-polarized edge channels originating from the spin-dependent exchange shift in graphene. We extract an exchange shift ranging from 27 – 32 meV, and show that it also produces an electrostatically tunable spin polarization of the electron/hole carriers in graphene ranging from − 50% to + 69% in the absence of a magnetic field. This proof of principle provides a starting point for the use of graphene as an electrostatically tunable source of spin current and could allow this system to generate a large magnetoresistance in gate tunable spin valve devices.

Suggested Citation

  • Boxuan Yang & Bibek Bhujel & Daniel G. Chica & Evan J. Telford & Xavier Roy & Fatima Ibrahim & Mairbek Chshiev & Maxen Cosset-Chéneau & Bart J. van Wees, 2024. "Electrostatically controlled spin polarization in Graphene-CrSBr magnetic proximity heterostructures," Nature Communications, Nature, vol. 15(1), pages 1-7, December.
  • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-48809-w
    DOI: 10.1038/s41467-024-48809-w
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    References listed on IDEAS

    as
    1. A. K. Geim & I. V. Grigorieva, 2013. "Van der Waals heterostructures," Nature, Nature, vol. 499(7459), pages 419-425, July.
    2. Hyunsoo Yang & Sergio O. Valenzuela & Mairbek Chshiev & Sébastien Couet & Bernard Dieny & Bruno Dlubak & Albert Fert & Kevin Garello & Matthieu Jamet & Dae-Eun Jeong & Kangho Lee & Taeyoung Lee & Mari, 2022. "Two-dimensional materials prospects for non-volatile spintronic memories," Nature, Nature, vol. 606(7915), pages 663-673, June.
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