Electrostatically controlled spin polarization in Graphene-CrSBr magnetic proximity heterostructures

Boxuan Yang (), Bibek Bhujel, Daniel G. Chica, Evan J. Telford, Xavier Roy, Fatima Ibrahim, Mairbek Chshiev, Maxen Cosset-Chéneau () and Bart J. van Wees
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Boxuan Yang: University of Groningen
Bibek Bhujel: University of Groningen
Daniel G. Chica: Columbia University
Evan J. Telford: Columbia University
Xavier Roy: Columbia University
Fatima Ibrahim: Univ. Grenoble Alpes, CEA, CNRS, Spintec
Mairbek Chshiev: Univ. Grenoble Alpes, CEA, CNRS, Spintec
Maxen Cosset-Chéneau: University of Groningen
Bart J. van Wees: University of Groningen

Nature Communications, 2024, vol. 15, issue 1, 1-7

Abstract: 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.

Date: 2024
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DOI: 10.1038/s41467-024-48809-w

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