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Issue 27, 2017
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Enhancing TMR and spin-filtration by using out-of-plane graphene insulating barrier in MTJs

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Abstract

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

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

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Publication details

The article was received on 07 Feb 2017, accepted on 12 Jun 2017 and first published on 14 Jun 2017


Article type: Paper
DOI: 10.1039/C7CP03342G
Citation: Phys. Chem. Chem. Phys., 2017,19, 17765-17772
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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, 19, 17765
    DOI: 10.1039/C7CP03342G

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