Ferrimagnetism in graphene

We show the existence of ferrimagnetic (FIM) ordering in n-type doped graphene on Au/Co interface with dislocation loops that are responsible for the uniform magnetizations on graphene sublattices. The synthesized system is promising for the realization of a circular dichroism Hall effect.

  Rybkin et al., Phys. Rev. Lett. 129, 226401 (2022).

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Using experimental and theoretical methods, we show that graphene can be magnetized by coupling to a ferromagnetic Co film through a Au monolayer. The presence of dislocation loops under graphene leads to a ferrimagnetic (FIM) ordering of moments in the two C sublattices. The band gap of ∼80 meV at the Dirac point is revealed by ARPES and DFT methods, and it is shown that the gap has a magnetic nature and exists for ferrimagnetic ordering. Tight-binding calculation results are in good agreement with the spin-ARPES data, showing the possibility for the synthesized system to implement the circular dichroism Hall effect.

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f Sublattice ferrimagnetism in quasifreestanding graphene
A.G. Rybkin, A.V. Tarasov, A.A. Rybkina, D.Yu. Usachov, A.E. Petukhov, A.V. Eryzhenkov, D.A. Pudikov, A.A. Gogina, I.I. Klimovskikh, G. Di Santo, L. Petaccia, A. Varykhalov, A.M. Shikin,
Phys. Rev. Lett. 129, 226401 (2022).
doi: 10.1103/PhysRevLett.129.226401

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