Electron Spin Resonance in a Multilayer Graphene Synthesized with Polystyrene

Semenikhin, P. V.; Ionov, A. N.; Nikolaeva, M. N.

doi:10.1134/s1063785020020273

Cited by 7 publications

(6 citation statements)

References 15 publications

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“…If the magnetization curves were related to ferromagnetic order, then we could detect it. However, the electron spin resonance investigation did not demonstrate magnetic ordering in the composite [ 32 ], which once again confirms the superconducting behavior of M r-GO (H).…”

Section: Introductionmentioning

confidence: 63%

“…Only diamagnetism is revealed in the composite in strong magnetic fields, which was too observed for r-GO at T = 300 K and polystyrene as individual components at all temperatures. It should be noted that this behavior, as well as a slight hysteresis observed at high temperatures in composite 2, are typical of all powder samples of granular high-temperature superconductor (HTSC) [32][33][34]55] and nanowire networks [35,56,57]. With decreasing temperature, the paramagnetic contribution to the total magnetization increases ( Figure 6, curve 2).…”

Section: The Analysis Of Magnetizationmentioning

confidence: 74%

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The Magnetization of a Composite Based on Reduced Graphene Oxide and Polystyrene

et al. 2021

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The use of reduced graphene oxide (r-GO) is a promising way of fabricating organic–inorganic composites with unique electrical and magnetic properties. In our work, polystyrene/r-GO composites were synthesized, in which both the components are linked together by covalent bonds. The r-GO used differs from the graphene obtained from graphite through mechanical exfoliation using the ‘scotch tape’ by presenting many structural defects. Binding in the composite structure between the components was confirmed by infrared spectroscopy. Elemental analysis was carried out by energy dispersive X-ray analysis. Scanning electron microscopy, X-ray diffraction, and Raman spectroscopy were used to monitor the 2D-order in exfoliated r-GO galleries. Using a vibrating-sample magnetometer, we have shown that the composite magnetization loops demonstrate type-II superconductivity up to room temperature due to r-GO flakes. We believe that a strain field in the r-GO flakes covalently binding to a polymeric matrix is responsible for the superconductivity phenomena.

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Section: Introductionmentioning

confidence: 63%

Section: The Analysis Of Magnetizationmentioning

confidence: 74%

The Magnetization of a Composite Based on Reduced Graphene Oxide and Polystyrene

et al. 2021

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“…Also, the number of holes, n h , has not been measured for C previously. Moreover, the gyromagnetic factor ( g ) of the graphene was found to be different depending on the underlying substrate, − and it has not been reported for graphene on Ni. It is also noteworthy to mention the difficulty associated with measuring the C K -edge due to the C contamination of the optical elements, which appear as a significant reduction in the incoming intensity at this particular energy.…”

Section: Resultsmentioning

confidence: 97%

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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“…Moreover, the g-value of the graphene was found to be different depending on the underlying substrate [49,54,55], but it has not been reported for graphene on Ni nor on Co substrates.…”

Section: X-ray Magnetic Circular Dichroism (Xmcd)mentioning

confidence: 86%

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

Aboljadayel¹,

Kinane²,

Vaz³

et al. 2021

Preprint

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We report the magnitude of the induced magnetic moment in CVD-grown epitaxial and rotateddomain graphene as a result of the proximity effect in the vicinity of the ferromagnetic substrates Co and Ni, using polarised neutron reflectivity (PNR). Although rotated-domain graphene is known to interact weakly with the ferromagnetic underlayer in comparison with the epitaxial graphene, the PNR results indicate an induced magnetic moment of ∼ 0.57 µ B /C atom at 10 K for both structures. The origin of the induced magnetic moment is found to be due to the opening of the graphene's Dirac cone as a result of the strong C p z -3d hybridisation, which was confirmed by additional PNR measurements using a non-magnetic Ni 9 Mo 1 and Cu substrates. We validated our PNR fitting models using the Bayesian uncertainty analysis and corroborated the results by X-ray magnetic circular dichroism measurements.

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Electron Spin Resonance in a Multilayer Graphene Synthesized with Polystyrene

Cited by 7 publications

References 15 publications

The Magnetization of a Composite Based on Reduced Graphene Oxide and Polystyrene

The Magnetization of a Composite Based on Reduced Graphene Oxide and Polystyrene

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

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

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