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Electronic structure, magnetoresistance and spin filtering in graphene|2 monolayer-CrI3(3)|graphene van der Waals magnetic tunnel junctions

In the pursuit of designing van der Waals magnetic tunneling junctions (vdW-MTJs) with two-dimensional (2D) intrinsic magnets, as well as to quantitatively reveal the microscopic nature governing the vertical tunneling pathways beyond the phenomenological descriptions on CrI(3)-based vdW-MTJs, we in...

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Autores principales: Zhang, Yibin, Liu, Jie, Deng, Renhao, Shi, Xuan, Tang, Huan, Chen, Hong, Yuan, Hongkuan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9536253/
https://www.ncbi.nlm.nih.gov/pubmed/36320544
http://dx.doi.org/10.1039/d2ra02988j
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author Zhang, Yibin
Liu, Jie
Deng, Renhao
Shi, Xuan
Tang, Huan
Chen, Hong
Yuan, Hongkuan
author_facet Zhang, Yibin
Liu, Jie
Deng, Renhao
Shi, Xuan
Tang, Huan
Chen, Hong
Yuan, Hongkuan
author_sort Zhang, Yibin
collection PubMed
description In the pursuit of designing van der Waals magnetic tunneling junctions (vdW-MTJs) with two-dimensional (2D) intrinsic magnets, as well as to quantitatively reveal the microscopic nature governing the vertical tunneling pathways beyond the phenomenological descriptions on CrI(3)-based vdW-MTJs, we investigate the structural configuration, electronic structure and spin-polarized quantum transport of graphene|2 monolayer(2ML)-CrI(3)|graphene heterostructure with Ag(111) layers as the electrode, using density functional theory (DFT) and its combination of non-equilibrium Green’s function (DFT-NEGF) methods. The in-plane lattice of CrI(3) layers is found to be stretched when placed on the graphene (Gr) layer, and the layer-stacking does not show any site selectivity. The charge transfer between CrI(3) and Gr layers make the CrI(3) layer lightly electron-doped, and the Gr layer hole-doped. Excitingly, the inter-layer hybridization between graphene and CrI(3) layers render the CrI(3) layer metallic in the majority spin channel, giving rise to an insulator-to-half-metal transition. Due to the metallic/insulator characteristics of the spin-majority/minority channel of the 2ML-CrI(3) barrier in vdW-MTJs, Gr|2ML-CrI(3)|Gr heterostructures exhibit an almost perfect spin filtering effect (SFE) near the zero bias in parallel magnetization, a giant tunneling magnetoresistance (TMR) ratio up to 2 × 10(4)%, and remarkable negative differential resistance (NDR). Our results not only give an explanation for the observed giant TMR in CrI(3)-based MTJs but also show the direct implications of 2D magnets in vdW-heterostructures.
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spelling pubmed-95362532022-10-31 Electronic structure, magnetoresistance and spin filtering in graphene|2 monolayer-CrI3(3)|graphene van der Waals magnetic tunnel junctions Zhang, Yibin Liu, Jie Deng, Renhao Shi, Xuan Tang, Huan Chen, Hong Yuan, Hongkuan RSC Adv Chemistry In the pursuit of designing van der Waals magnetic tunneling junctions (vdW-MTJs) with two-dimensional (2D) intrinsic magnets, as well as to quantitatively reveal the microscopic nature governing the vertical tunneling pathways beyond the phenomenological descriptions on CrI(3)-based vdW-MTJs, we investigate the structural configuration, electronic structure and spin-polarized quantum transport of graphene|2 monolayer(2ML)-CrI(3)|graphene heterostructure with Ag(111) layers as the electrode, using density functional theory (DFT) and its combination of non-equilibrium Green’s function (DFT-NEGF) methods. The in-plane lattice of CrI(3) layers is found to be stretched when placed on the graphene (Gr) layer, and the layer-stacking does not show any site selectivity. The charge transfer between CrI(3) and Gr layers make the CrI(3) layer lightly electron-doped, and the Gr layer hole-doped. Excitingly, the inter-layer hybridization between graphene and CrI(3) layers render the CrI(3) layer metallic in the majority spin channel, giving rise to an insulator-to-half-metal transition. Due to the metallic/insulator characteristics of the spin-majority/minority channel of the 2ML-CrI(3) barrier in vdW-MTJs, Gr|2ML-CrI(3)|Gr heterostructures exhibit an almost perfect spin filtering effect (SFE) near the zero bias in parallel magnetization, a giant tunneling magnetoresistance (TMR) ratio up to 2 × 10(4)%, and remarkable negative differential resistance (NDR). Our results not only give an explanation for the observed giant TMR in CrI(3)-based MTJs but also show the direct implications of 2D magnets in vdW-heterostructures. The Royal Society of Chemistry 2022-10-06 /pmc/articles/PMC9536253/ /pubmed/36320544 http://dx.doi.org/10.1039/d2ra02988j Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/
spellingShingle Chemistry
Zhang, Yibin
Liu, Jie
Deng, Renhao
Shi, Xuan
Tang, Huan
Chen, Hong
Yuan, Hongkuan
Electronic structure, magnetoresistance and spin filtering in graphene|2 monolayer-CrI3(3)|graphene van der Waals magnetic tunnel junctions
title Electronic structure, magnetoresistance and spin filtering in graphene|2 monolayer-CrI3(3)|graphene van der Waals magnetic tunnel junctions
title_full Electronic structure, magnetoresistance and spin filtering in graphene|2 monolayer-CrI3(3)|graphene van der Waals magnetic tunnel junctions
title_fullStr Electronic structure, magnetoresistance and spin filtering in graphene|2 monolayer-CrI3(3)|graphene van der Waals magnetic tunnel junctions
title_full_unstemmed Electronic structure, magnetoresistance and spin filtering in graphene|2 monolayer-CrI3(3)|graphene van der Waals magnetic tunnel junctions
title_short Electronic structure, magnetoresistance and spin filtering in graphene|2 monolayer-CrI3(3)|graphene van der Waals magnetic tunnel junctions
title_sort electronic structure, magnetoresistance and spin filtering in graphene|2 monolayer-cri3(3)|graphene van der waals magnetic tunnel junctions
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9536253/
https://www.ncbi.nlm.nih.gov/pubmed/36320544
http://dx.doi.org/10.1039/d2ra02988j
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