Proximity Spin-Orbit Torque on a Two-Dimensional Magnet within van der Waals Heterostructure: Current-Driven Antiferromagnet-to-Ferromagnet Reversible Nonequilibrium Phase Transition in Bilayer CrI3

Nano Letters
Kapildeb DoluiBranislav K Nikolić

Abstract

The recently discovered two-dimensional magnetic insulator CrI3 is an intriguing case for basic research and spintronic applications since it is a ferromagnet in the bulk but an antiferromagnet in bilayer form, with its magnetic ordering amenable to external manipulations. Using the first-principles quantum transport approach, we predict that injecting unpolarized charge current parallel to the interface of the bilayer-CrI3/monolayer-TaSe2 van der Waals (vdW) heterostructure will induce spin-orbit torque and thereby drive the dynamics of magnetization on the first monolayer of CrI3 in direct contact with TaSe2. By combining the calculated complex angular dependence of spin-orbit torque with the Landau-Lifshitz-Gilbert equation for classical dynamics of magnetization, we demonstrate that current pulses can switch the direction of magnetization on the first monolayer to become parallel to that of the second monolayer, thereby converting CrI3 from antiferromagnet to ferromagnet while not requiring any external magnetic field. We explain the mechanism of this reversible current-driven nonequilibrium phase transition by showing that first monolayer of CrI3 carries current due to evanescent wave functions injected by metallic transit...Continue Reading

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Citations

Nov 21, 2020·Physical Review Letters·Klaus ZollnerJaroslav Fabian
Aug 14, 2020·Nano Letters·D SorianoJ Fernández-Rossier
May 29, 2021·Physical Review Letters·Marko D PetrovićBranislav K Nikolić
Jul 21, 2021·Nature Nanotechnology·Juan F SierraSergio O Valenzuela
Oct 2, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Zhi-Bo YinMeng-Qiu Long

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