2D-MTJs: introducing 2D materials in magnetic tunnel junctions

Piquemal-Banci, Maëlis; Galceran, Regina; Martin, Marie‐Blandine; Godel, Florian; Anane, A.; Pétroff, F.; Dlubak, Bruno; Sénéor, Pierre

doi:10.1088/1361-6463/aa650f

Cited by 80 publications

(97 citation statements)

References 83 publications

(149 reference statements)

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“…For commercial applications, one needs to grow these materials on a large scale using the chemical vapour deposition (CVD) technology. Recently, the potential of CVD grown 2D materials has been explored for the production of spintronics devices 6,117,129,139,140 . Several studies have shown an increased interest in incorporating CVD grown hBN tunnel barriers for electrical spin injection into both CVD-graphene 125 and exfoliatedgraphene 6,117,118,126 spin valve devices.…”

Section: E Cvd-hbn Tunnel Barriermentioning

confidence: 99%

Electrical spin injection, transport, and detection in graphene-hexagonal boron nitride van der Waals heterostructures: progress and perspectives

2018

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The current research in graphene spintronics strives for achieving a long spin lifetime, and efficient spin injection and detection in graphene. In this article, we review how hexagonal boron nitride (hBN) has evolved as a crucial substrate, as an encapsulation layer, and as a tunnel barrier for manipulation and control of spin lifetimes and spin injection/detection polarizations in graphene spin valve devices. First, we give an overview of the challenges due to conventional SiO2 substrate for spin transport in graphene followed by the progress made in hBN based graphene heterostructures. Then we discuss in detail the shortcomings and developments in using conventional oxide tunnel barriers for spin injection into graphene followed by introducing the recent advancements in using the crystalline single/bi/tri-layer hBN tunnel barriers for an improved spin injection and detection which also can facilitate two-terminal spin valve and Hanle measurements, at room temperature, and are of technological importance. A special case of bias induced spin polarization of contacts with exfoliated and chemical vapour deposition (CVD) grown hBN tunnel barriers is also discussed. Further, we give our perspectives on utilizing graphene-hBN heterostructures for future developments in graphene spintronics.

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Section: E Cvd-hbn Tunnel Barriermentioning

confidence: 99%

Electrical spin injection, transport, and detection in graphene-hexagonal boron nitride van der Waals heterostructures: progress and perspectives

2018

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“…In the 2D materials family, major research efforts have been focused toward van der Waals solids like graphene, hexagonal boron nitride (hBN), MX 2 (M = M, W and X = S, Se), black phosphorus, and many more. 2D materials with a tunable bandgap and high carrier mobility along with magnetic properties can be utilized in magnetoelectric and magnetic storage media . According to the Mermin–Wagner theorem, long‐range magnetic ordering should be absent in 1D or 2D systems because of strong thermal fluctuations.…”

Section: The Structural Optimization Lattice Constant Of the Surface mentioning

confidence: 99%

Chromiteen: A New 2D Oxide Magnetic Material from Natural Ore

Yadav

Shirodkar

Lertcumfu

et al. 2018

Adv Materials Inter

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like graphene, hexagonal boron nitride (hBN), MX 2 (M = M, W and X = S, Se), black phosphorus, and many more. 2D materials with a tunable bandgap and high carrier mobility along with magnetic properties can be utilized in magnetoelectric and magnetic storage media. [8][9][10][11] According to the Mermin-Wagner [12] theorem, long-range magnetic ordering should be absent in 1D or 2D systems because of strong thermal fluctuations. However, the thermal fluctuations in 2D magnetic materials can be controlled by creating imperfections and also by chemical functionalization. [8] Recently, a chemical functionalization approach was used for fluorinating hexagonal boron nitride (h-BN) 2D flake, where a roomtemperature weak ferromagnetism was discovered. [8] Apart from that, most of the 2D magnetic materials were prepared through surface deposition or peeling, that is, defect-induced magnetism arising out of vacancies at grain boundaries, or adatoms of other elements binding with major group elements at the edges, or by adding magnetic elements through substitution or exchange interaction. [13][14][15][16] Recently, an exciting study showing the intrinsic The absence of inherent magnetism in the family of 2D materials limits its application in magnetoelectric and magnetic storage media. Here, a simple scalable route for the synthesis of magnetic 2D material chromite (chromiteen) via sonication-assisted liquid-phase exfoliation is demonstrated. The (111) plane of the exfoliated chromite is found to be the most stable which is confirmed by its common occurrence in exfoliation. Further, the stability and dispersion are verified by ab initio density functional theoretical simulations. Magnetic measurements over a large temperature range of 4 K ≤ T ≤ 300 K confirm ferromagnetic/superparamagnetic order with nearly 40 times higher magnetic moment saturation in chromiteen compared to chromite. The results reveal that 2D chromiteen causes a change in the magnetic behavior with respect to chromite which could be ascribed to the increase in the lattice strain as well as a magnetic strain due to high ferromagnetic fraction in 2D plane.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/admi.201800549.The last decade of materials based research has produced many atomically thin 2D materials, which exhibit extraordinary physical, chemical, optical, and mechanical properties, and find uses in sensor, biomedical, environmental, and energy applications. [1][2][3][4][5][6][7] In the 2D materials family, major research efforts have been focused toward van der Waals solids

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“…The spin polarization of the tunneling electrons ultimately depends on the electronic structure of the interfaces. Over the last decade, significant research efforts have been dedicated to introduce 2D materials to control and tailor the magnetoresistive response of the interfaces [76]. Boosted by the theoretical prediction of perfect spin filtering by few of its layers [77][78][79][80], graphene has been the first 2D material to be investigated [81][82][83], rapidly followed by insulating h-BN [84][85][86] and semi-conducting transition metal dichalcogenides (TMDCs) [87][88][89][90].…”

Section: Magnetoresistance In 2d Tunnel Junctionsmentioning

confidence: 99%

Computational Atomistic Modeling in Carbon Flatland and Other 2D Nanomaterials

et al. 2020

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As in many countries, the rise of nanosciences in Belgium has been triggered in the eighties in the one hand, by the development of scanning tunneling and atomic force microscopes offering an unprecedented possibility to visualize and manipulate the atoms, and in the other hand, by the synthesis of nano-objects in particular carbon nanostructures such as fullerene and nanotubes. Concomitantly, the increasing calculating power and the emergence of computing facilities together with the development of DFT-based ab initio softwares have brought to nanosciences field powerful simulation tools to analyse and predict properties of nano-objects. Starting with 0D and 1D nanostructures, the floor is now occupied by the 2D materials with graphene being the bow of this 2D ship. In this review article, some specific examples of 2D systems has been chosen to illustrate how not only density functional theory (DFT) but also tight-binding (TB) techniques can be daily used to investigate theoretically the electronic, phononic, magnetic, and transport properties of these atomically thin layered materials.

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2D-MTJs: introducing 2D materials in magnetic tunnel junctions

Cited by 80 publications

References 83 publications

Electrical spin injection, transport, and detection in graphene-hexagonal boron nitride van der Waals heterostructures: progress and perspectives

Electrical spin injection, transport, and detection in graphene-hexagonal boron nitride van der Waals heterostructures: progress and perspectives

Chromiteen: A New 2D Oxide Magnetic Material from Natural Ore

Computational Atomistic Modeling in Carbon Flatland and Other 2D Nanomaterials

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