Hidden interplay of current-induced spin and orbital torques in bulk Fe${}_3$GeTe${}_2$

Abstract

Low crystal symmetry of magnetic van der Waals materials naturally promotes spin-orbital complexity unachievable in common magnetic materials used for spin-orbit torque switching. Here, using first-principles methods, we demonstrate that an interplay of spin and orbital degrees of freedom has a profound impact on spin-orbit torques in a prototype van der Waals ferromagnet: Fe${}_3$GeTe${}_2$ (FGT). While we show that bulk FGT hosts strong "hidden" current-induced torques harvested by each of its layers, we uncover that their origin alternates between the conventional spin flux torque and the so-called orbital torque as the magnetization direction is varied. A drastic difference in the behavior of the two types of torques results in a non-trivial evolution of switching properties with doping. Our findings promote the design of non-equilibrium orbital properties as the guiding mechanism for crafting the properties of spin-orbit torques in layered van der Waals materials.

References in corpus (19)

• Giant Orbital Hall Effect in Transition Metals: Origin of Large Spin and Anomalous Hall Effects
• Orbitronics: Orbital Currents in Solids
• Highly efficient spin-orbit torque and switching of layered ferromagnet Fe3GeTe2
• Efficient conversion of orbital Hall current to spin current for spin-orbit torque switching
• Observation of the Orbital Rashba-Edelstein Magnetoresistance
• Maximally Localized Wannier Functions within the FLAPW formalism
• Theory of Current-Induced Angular Momentum Transfer Dynamics in Spin-Orbit Coupled Systems
• Disentangling orbital and valley Hall effects in bilayers of transition metal dichalcogenides
• Orbital Hall effect as an alternative to valley Hall effect in gapped graphene
• Giant Intrinsic Spin and Orbital Hall Effects in Sr2MO4 (M=Ru,Rh,Mo)
• Current Control of Magnetism in Two-Dimensional Fe3GeTe2
• Gigantic current control of coercive field and magnetic memory based on nm-thin ferromagnetic van der Waals Fe3GeTe2
• Intrinsic orbital and spin Hall effects in monolayer transition metal dichalcogenides
• Uncovering and tailoring hidden Rashba spin-orbit splitting in centrosymmetric crystals
• Toward 100% Spin-Orbit Torque Efficiency with High Spin-Orbital Hall Conductivity Pt-Cr Alloys
• Strong bulk spin-orbit torques quantified in the van der Waals ferromagnet Fe3GeTe2
• Engineering the dynamics of topological spin textures by anisotropic spin-orbit torques
• Microscopic model for the hidden Rashba effect in YBa${}_2$Cu${}_3$O${}_{6+x}$
• Controllable Spin Current in van der Waals Ferromagnet Fe3GeTe2

Cited by in corpus (5)

• Broken inversion symmetry in van der Waals topological ferromagnetic metal iron germanium telluride
• All van der Waals three-terminal SOT-MRAM realized by topological ferromagnet Fe3GeTe2
• Imaging current control of magnetization in Fe${}_3$GeTe${}_2$ with a widefield nitrogen-vacancy microscope
• Promoting $p$-based Hall effects by $p$-$d$-$f$ hybridization in Gd-based dichalcogenides
• Orbital torques and orbital pumping in two-dimensional rare-earth dichalcogenides