Spin relaxation and proximity effect in WS2/graphene/fluorographene non-local spin valves

Friedman, Adam L.; McCreary, Kathleen M.; Robinson, Jeremy T.; Erve, O.M.J. van ‘t; Jonker, B. T.

doi:10.1016/j.carbon.2018.01.080

Cited by 16 publications

(24 citation statements)

References 48 publications

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“…The actual spin dynamics will depend on the disorder profile and the nature of the spin-orbit coupling. In graphene/TMDC heterostructures, experimental results suggest that the relaxation mechanism occurs in the DP regime 40,135,141,150,151 , where the spin precession of the electrons is interrupted by scattering events, inducing motional narrowing and yielding τ s ∝ 1/τ p .…”

Section: Microscopic Theory Of Spin Relaxationmentioning

confidence: 99%

Spin transport in graphene/transition metal dichalcogenide heterostructures

et al. 2018

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Since its discovery, graphene has been a promising material for spintronics: its low spin-orbit coupling, negligible hyperfine interaction, and high electron mobility are obvious advantages for transporting spin information over long distances. However, such outstanding transport properties also limit the capability to engineer active spintronics, where strong spin-orbit coupling is crucial for creating and manipulating spin currents. To this end, transition metal dichalcogenides, which have larger spin-orbit coupling and good interface matching, appear to be highly complementary materials for enhancing the spin-dependent features of graphene while maintaining its superior charge transport properties. In this review, we present the theoretical framework and the experiments performed to detect and characterize the spin-orbit coupling and spin currents in graphene/transition metal dichalcogenide heterostructures. Specifically, we will concentrate on recent measurements of Hanle precession, weak antilocalization and the spin Hall effect, and provide a comprehensive theoretical description of the interconnection between these phenomena.

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Section: Microscopic Theory Of Spin Relaxationmentioning

confidence: 99%

Spin transport in graphene/transition metal dichalcogenide heterostructures

et al. 2018

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“…These could range from allepitaxial metallic NLSVs where the high degree of order could place a stronger emphasis on heat conduction across interfaces that could alter thermal profiles, to graphene and other 2D systems with exceptionally high thermal conductivity and potentially poor coupling to supporting substrates. 53,63 V. CONCLUSION…”

Section: B Thermal Modeling and Determination Of Ane Coefficientmentioning

confidence: 99%

Thermal gradients and anomalous Nernst effects in membrane-supported nonlocal spin valves

2019

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Metallic non-local spin valves (NLSVs) are important in modern spintronics due to their ability to separate pure spin current from charge current. These metallic nanostructures, often constructed from features with widths in the deep sub-micron regime, generate significant thermal gradients in operation, and the heat generated has important consequences for spin injection and transport. We use e-beam nanolithography to manufacture NLSVs with Ni-Fe alloy ferromagnetic nanowires and aluminum spin channels on 500 nm silicon nitride (Si-N) membranes in order to lower the thermal conductance of the substrate dramatically. While this extreme example of thermal engineering in a spintronic system increases the background non-local signals in ways expected based on earlier work, it also enhances thermoelectric effects, including the anomalous Nernst effect and reveals a previously unknown thermally-assisted electrical spin injection that results from a purely in-plane thermal gradient. We examine these effects as a function of temperature and, by careful comparison with 2D finite element models of the thermal gradients calculated at a single temperature, demonstrate that the anomalous Nernst coefficient of the 35 nm thick Ni-Fe alloy, R N = 0.17 at T = 200 K, is in line with the few previous measurements of this effect for thin films.

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“…In addition, to control the spin relaxation in graphene‐based spintronic devices, they demonstrated a WS 2 /graphene/fluorographene heterostructure‐based nonlocal spin valve device. [ 156 ] They established that the D'yakonov‐Perel’ (DP) spin relaxation mechanism was dominant for the WS 2 /graphene/fluorographene devices, and the strong elastic spin‐flip scattering was dominant in the reference fluorographene/graphene devices. They attributed this difference to the WS 2 substrate layer, which reduced elastic scattering and induced proximity effects to produce the SOC‐based DP spin relaxation.…”

Section: Properties and Applications Of Halogenated 2d Materialsmentioning

confidence: 99%

Halogen Functionalization in the 2D Material Flatland: Strategies, Properties, and Applications

Tang

Fan

Zhang

2021

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Given the electronegativity and bonding environment of halogen elements, halogenation (i.e., fluorination, chlorination, bromination, and iodination) serves as a versatile strategy for chemical modifications of materials. The combination of halogens and 2D materials has triggered extensive interests since the first report on graphene fluorination in 2008. Subsequently, scholars consistently conduct pre‐, in‐process, or posthalogenation modifications of emerging 2D materials to achieve desired properties and broad device applications. They also continuously explore the role of halogens in 2D material functionalization. The multiple advantages introduced by halogen decoration make 2D materials outstanding from each subclass. In this review, an overall retrospect is provided on the research advances in the area of 2D material halogenation, including experimental halogenation strategies, halogen‐triggered novel physics and properties, and advanced applications across the studied objects. Future research directions in this area are also proposed.

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Spin relaxation and proximity effect in WS2/graphene/fluorographene non-local spin valves

Cited by 16 publications

References 48 publications

Spin transport in graphene/transition metal dichalcogenide heterostructures

Spin transport in graphene/transition metal dichalcogenide heterostructures

Thermal gradients and anomalous Nernst effects in membrane-supported nonlocal spin valves

Halogen Functionalization in the 2D Material Flatland: Strategies, Properties, and Applications

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