Magnon-assisted tunnelling in van der Waals heterostructures based on CrBr3

Davit Ghazaryan, M. T. Greenway, Zihao Wang, Victor Guarochico Moreira, Ivan J. Vera-Marun, Jun Yin, Yuanxun Liao, Sergey V. Morozov, O. Kristanovski, A. I. Lichtenstein, M. I. Katsnelson, F Withers, Artem Mishchenko, L Eaves, Andre Geim, Konstantin Novoselov, Abhishek Misra

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    Abstract

    Van der Waals heterostructures, which are composed of layered two-dimensional materials, offer a platform to investigate a diverse range of physical phenomena and could be of use in a variety of applications. Heterostructures containing two-dimensional ferromagnets, such as chromium triiodide (CrI3), have recently been reported, which could allow two-dimensional spintronic devices to be developed. Here we study tunnelling through thin ferromagnetic chromium tribromide (CrBr3) barriers that are sandwiched between graphene electrodes. In devices with non-magnetic barriers, conservation of momentum can be relaxed by phonon-assisted tunnelling or by tunnelling through localized states. In contrast, in the devices with ferromagnetic barriers, the major tunnelling mechanisms are the emission of magnons at low temperatures and the scattering of electrons on localized magnetic excitations at temperatures above the Curie temperature. Magnetoresistance in the graphene electrodes further suggests induced spin–orbit coupling and proximity exchange via the ferromagnetic barrier. Tunnelling with magnon emission offers the possibility of spin injection.
    Original languageEnglish
    Pages (from-to)344-349
    Number of pages6
    JournalNature Electronics
    Volume1
    Issue number6
    Early online date13 Jun 2018
    DOIs
    Publication statusPublished - Jun 2018

    Keywords

    • graphene
    • spintronics
    • tunnelling magnetoresistance
    • 2D materials
    • van der Waals heterostructures

    Research Beacons, Institutes and Platforms

    • National Graphene Institute

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