Giant magneto-optical Faraday effect of graphene on Co in the soft x-ray range

Mertins, H.-Ch.; Jansing, C.; Krivenkov, Maxim; Varykhalov, A.; Rader, O.; Wahab, Hud; Timmers, H.; Gaupp, A.; Sokolov, Andréy; Tesch, Marc F.; Oppeneer, Peter M.

doi:10.1103/physrevb.98.064408

Cited by 5 publications

(7 citation statements)

References 26 publications

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“…Graphene has also been shown to mediate interlayer exchange coupling between magnetic layers [17]. Graphene electronic and magnetic properties are affected by the presence of a ferromagnetic (FM) film as well: besides very long spin diffusion length [18], induction of magnetism in graphene was observed for instance in graphene/Ni [19] and graphene/Co [20] systems. Recently, it has been predicted that magnetic properties of graphene can be tuned by electric polarization in multiferroics due to the proximity effect [21].…”

Section: Introductionmentioning

confidence: 99%

Single-layer graphene on epitaxial FeRh thin films

Uhlíř

Pressacco

Arregi

et al. 2020

Applied Surface Science

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Graphene is a 2D material that displays excellent electronic transport properties with prospective applications in many fields. Inducing and controlling magnetism in the graphene layer, for instance by proximity of magnetic materials, may enable its utilization in spintronic devices. This paper presents fabrication and detailed characterization of single-layer graphene formed on the surface of epitaxial FeRh thin films. The magnetic state of the FeRh surface can be controlled by temperature, magnetic field or strain due to interconnected order parameters. Characterization of graphene layers by X-ray Photoemission and X-ray Absorption Spectroscopy, Low-Energy Ion Scattering, Scanning Tunneling Microscopy, and Low-Energy Electron Microscopy shows that graphene is single-layer, polycrystalline and covers more than 97% of the substrate. Graphene displays several preferential orientations on the FeRh(001) surface with unit vectors of graphene rotated by 30°, 15°, 11°, and 19° with respect to FeRh substrate unit vectors. In addition, the graphene layer is capable to protect the films from oxidation when exposed to air for several months. Therefore, it can be also used as a protective layer during fabrication of magnetic elements or as an atomically thin spacer, which enables incorporation of switchable magnetic layers within stacks of 2D materials in advanced devices.

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Section: Introductionmentioning

confidence: 99%

Single-layer graphene on epitaxial FeRh thin films

Uhlíř

Pressacco

Arregi

et al. 2020

Applied Surface Science

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“…The PNR fits have shown that at 10 K a magnetic moment of ∼0.41 μ B /C atom was induced in both the rotated-domain and the epitaxial graphene grown on Ni films. These results indicate larger moments than previously reported. , In ref , Mertins et al estimated the magnetic moment of graphene to be 0.14 ± 0.3 μ B /C atom when grown on a hcp Co(0001) film. They obtained this value by comparing the XMCD reflectivity signal of graphene to that of the underlayer Co film .…”

Section: Resultsmentioning

confidence: 59%

“…These results indicate larger moments than previously reported. , In ref , Mertins et al estimated the magnetic moment of graphene to be 0.14 ± 0.3 μ B /C atom when grown on a hcp Co(0001) film. They obtained this value by comparing the XMCD reflectivity signal of graphene to that of the underlayer Co film . Weser et al suggested a similar value (0.05–0.1 μ B /C atom) for the magnetic moment induced in a monolayer of graphene grown on a Ni(111) film .…”

Section: Resultsmentioning

confidence: 59%

“…They obtained this value by comparing the XMCD reflectivity signal of graphene to that of the underlayer Co film. 27 Weser et al suggested a similar value (0.05−0.1 μ B /C atom) for the magnetic moment induced in a monolayer of graphene grown on a Ni(111) film. 14 However, their assumption was based on comparing the graphene/Ni system with other C/3d TM structures, such as a C/Fe multilayer with 0.55 nm of C, 63 and carbon nanotubes (CNTs) on a Co film, 64 where magnetic moments of 0.05 and 0.1 μ B /C atom were estimated, respectively.…”

Section: ■ Results and Discussionmentioning

confidence: 84%

“…These results indicate larger moments than previously reported. 14,27 In ref 27, Mertins et al estimated the magnetic moment of graphene to be 0.14 ± 0.3 μ B /C atom when grown on a hcp Co(0001) film. They obtained this value by comparing the XMCD reflectivity signal of graphene to that of the underlayer Co film.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Determining the Proximity Effect-Induced Magnetic Moment in Graphene by Polarized Neutron Reflectivity and X-ray Magnetic Circular Dichroism

Aboljadayel

Kinane

Vaz

et al. 2023

ACS Appl. Mater. Interfaces

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We report the magnitude of the induced magnetic moment in CVD-grown epitaxial and rotated-domain graphene in proximity with a ferromagnetic Ni film, using polarized neutron reflectivity (PNR) and X-ray magnetic circular dichroism (XMCD).The XMCD spectra at the C K-edge confirm the presence of a magnetic signal in the graphene layer, and the sum rules give a magnetic moment of up to ∼0.47 μ B /C atom induced in the graphene layer. For a more precise estimation, we conducted PNR measurements. The PNR results indicate an induced magnetic moment of ∼0.41 μ B /C atom at 10 K for epitaxial and rotated-domain graphene. Additional PNR measurements on graphene grown on a nonmagnetic Ni 9 Mo 1 substrate, where no magnetic moment in graphene is measured, suggest that the origin of the induced magnetic moment is due to the opening of the graphene's Dirac cone as a result of the strong C p z -3d hybridization.

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