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Epitaxial Graphene/Ferromagnetic (Gr/FM) structures deposited onto heavy metals (HM) have been proposed for the realization of novel spin-orbitronic devices because of their perpendicular magnetic anisotropy and sizeable Dzyaloshinskii-Moriya interaction, which in turn allow for enhanced thermal stability and stabilization of chiral spin textures [1,2]. In this work we elucidate the nature of the induced Spin-Orbit Coupling (SOC) at Gr/Co interface on Ir by investigating different FM thicknesses [3]. Angular and Spin-Resolved Photoemission Spectroscopy experiments carried out at Cassiopée beamline (Soleil synchrotron), combined with Density Functional Theory calculations show that the interaction of the HM with the C atomic layer via hybridization with the FM is indeed the source of the SOC in the Gr layer. Furthermore, our studies in ultra-thin (2 ML) Co film underneath Gr reveal an energy splitting of $\sim$ 100 meV (negligible) for in-plane (out-of-plane) spin polarized Gr $\pi$ bands, consistent with a Rashba-SOC at the Gr/Co interface, which is either the fingerprint or the origin of the Dzyaloshinskii Moriya interaction. Interestingly, at larger Co thicknesses ($\sim$ 10 ML), neither in-plane or out-of-plane spin splitting is observed, indicating Gr is almost decoupled from the HM.
- Ajejas, F. et al. Nano Lett. 18 5364–5372 (2018).
- Ajejas, F. et al. ACS Appl. Mater. Interfaces 12 4088–4096 (2020).
- Muñiz Cano, B. et al. arXiv:2206.04351 [cond-mat.mtrl-sci] (2022).
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