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Direct Spectroscopic Evidence of Magnetic Proximity Effect in MoS2 Monolayer on Graphene/Co

Cite this: ACS Nano 2022, 16, 5, 7448–7456
Publication Date (Web):April 20, 2022
https://doi.org/10.1021/acsnano.1c10391
Copyright © 2022 American Chemical Society
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    Abstract

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    A magnetic field modifies optical properties and provides valley splitting in a molybdenum disulfide (MoS2) monolayer. Here we demonstrate a scalable approach to the epitaxial synthesis of MoS2 monolayer on a magnetic graphene/Co system. Using spin- and angle-resolved photoemission spectroscopy we observe a magnetic proximity effect that causes a 20 meV spin-splitting at the Γ̅ point and canting of spins at the K̅ point in the valence band toward the in-plane direction of cobalt magnetization. Our density functional theory calculations reveal that the in-plane spin component at K̅ is localized on Co atoms in the valence band, while in the conduction band it is localized on the MoS2 layer. The calculations also predict a 16 meV spin-splitting at the Γ̅ point and 8 meV K̅- valley asymmetry for an out-of-plane magnetization. These findings suggest control over optical transitions in MoS2 via Co magnetization. Our estimations show that the magnetic proximity effect is equivalent to the action of the magnetic field as large as 100 T.

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    The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acsnano.1c10391.

    • LEED images for several attempts to synthesize MoS2 on graphene/Co system. ARPES measurements of the graphene/Co system after its annealing in sulfur flux. LEED images of the graphene/Co system before and after sulfur intercalation. XPS S 2p spectra comparison for MoS2/graphene/CoSx and graphene/CoSx systems. STM topography of graphene/CoSx areas in between MoS2 islands. Correspondence between STM and LEED data for the graphene/CoSx system. STM topography of sample areas covered with MoS2: large-scale view, moiré pattern, and domain boundaries. DFT representation of MoS2 electronic and spin states of the model system 4 × 4 MoS2/5 × 5 graphene/4 layers of 5 × 5 Co, and its comparison to free-standing MoS2 in the case of out-of-plane Co magnetization. DFT representation of free-standing MoS2 electronic and spin states under different external conditions: zero magnetic field, in-plane magnetic field, and out-of-plane magnetic field. Schematic representation of possible optical effects for in-plane and out-of-plane Co magnetization scenarios. Illustration of how the spin-resolved photoemission spectra from mirror MoS2 domains integrate into one measured spectrum (PDF)

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    Most electronic Supporting Information files are available without a subscription to ACS Web Editions. Such files may be downloaded by article for research use (if there is a public use license linked to the relevant article, that license may permit other uses). Permission may be obtained from ACS for other uses through requests via the RightsLink permission system: http://pubs.acs.org/page/copyright/permissions.html.

    Cited By

    This article is cited by 1 publications.

    1. Alexander V. Eryzhenkov, Artem V. Tarasov, Alexander M. Shikin, Artem G. Rybkin. Non-Trivial Band Topology Criteria for Magneto-Spin–Orbit Graphene. Symmetry 2023, 15 (2) , 516. https://doi.org/10.3390/sym15020516
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