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Enhancing TMR and spin-filtration by using out-of-plane graphene insulating barrier in MTJs

Abstract

First principles investigations are performed on understanding the spin-polarized transport in Magnetic Tunnel Junctions (MTJs) consisting of out-of-plane graphene sheet as a barrier in between two CrO2 Half-Metallic-Ferromagnetic (HMF) electrodes. On comparison of the results with the results of in-plane graphene based MTJs reported in past, it is observed that out-of-plane structures offer high TMR ~ 100% and the transport phenomenon is tunneling since there are no transmission states near Fermi level. However, in in-plane structure the transport phenomenon cannot be tunneling since there are significant number of transmission states near Fermi level, although high Magneto Resistance (MR) ~ 90% is observed in it. Both TMR and Spin Injection Efficiency η (Spin-Filtration) are higher in out-of-plane structures in comparison to in-plane structures, which is due to graphene sheet acting as a perfect barrier in out-of-plane structure that results in negligible spin down current (I↓) in both Parallel Configuration (PC) and Antiparallel Configuration (APC).

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Publication details

The article was accepted on 12 Jun 2017 and first published on 14 Jun 2017


Article type: Paper
DOI: 10.1039/C7CP03342G
Citation: Phys. Chem. Chem. Phys., 2017, Accepted Manuscript
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    Enhancing TMR and spin-filtration by using out-of-plane graphene insulating barrier in MTJs

    S. Meena and S. Choudhary, Phys. Chem. Chem. Phys., 2017, Accepted Manuscript , DOI: 10.1039/C7CP03342G

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