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

By D. Ghazaryan, M. Greenaway, Z. Wang, V. Guarochico-Moreira, I. Vera-Marun, J. Yin, Y. Liao, S. Morozov, O. Kristanovski, A. Lichtenstein and 7 more. Nature Electronics, 2018

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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.Electrons can tunnel through thin ferromagnetic CrBr3 barriers, sandwiched between graphene electrodes, via the emission of magnons, which suggests that these magnetic tunnel barriers could be used for spin injection.

Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/21fb282a60a03f5e4406fbca44b5bab2d5f191d8

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Citations in the corpus

Colloquium : Spintronics in graphene and other two-dimensional materials (2019, background): “…could integrate the spin transport properties of graphene with the memory of the 2D magnet, exploiting proximity-induced magnetization by the 2D magnet into graphene as demonstrated via the proximity anisotropic magnetoresistance effect in graphene/CrB3 heterostructures (Ghazaryan et al., 2018).”
Magnon Transport in Quasi-Two-Dimensional van der Waals Antiferromagnets (2019, background): “The important role of magnon-assistant tunneling through thin CrBr3 barriers has been shown in the graphene/CrBr3/graphene heterostructures [22].”
Probing and controlling magnetic states in 2D layered magnetic materials (2019, unknown): “…the magnetic ground state, spin Hamiltonians can also be used to calculate collective magnetic excitations 41,71,72 (for example, magnon dispersions), which provide important understanding for experimental studies of magnetic resonances 72–75 , spin-wave excitations 76 and neutron scattering.”