Spin-orbit torque for field-free switching in C_{3v} crystals
arXiv:2301.01133 · doi:10.1103/PhysRevB.107.094422
Abstract
Spin-orbit torques in noncentrosymmetric polycrystalline magnetic heterostructures are usually described in terms of field-like and damping-like torques. However, materials with a lower symmetry point group can exhibit torques whose behavior substantially deviates from the conventional ones. In particular, based on symmetry arguments it was recently proposed that systems belonging to the C_{3v} point group display spin-orbit torques that can promote field-free switching [Liu et al. Nature Nanotechnology 16, 277 (2021)]. In the present work, we analyze the general form of the torques expected in C3v crystals using the Invariant Theory. We uncover several new components that arise from the coexistence of the three-fold rotation and mirror symmetries. Using both tight binding model and first principles simulations, we show that these unconventional torque components arise from the onset of trigonal warping of the Fermi surface and can be as large as the damping-like torque. In other words, the Fermi surface warping is a key indicator to the onset of field-free switching in low symmetry crystals.
References in corpus (34)
- First observation of Spin-Momentum Helical Locking in Bi2Se3 and Bi2Te3, demonstration of Topological-Order at 300K and a realization of topological-transport-regime
- Spin Torque Ferromagnetic Resonance Induced by the Spin Hall Effect
- Current-induced spin-orbit torques in ferromagnetic and antiferromagnetic systems
- Switching of perpendicular magnetization by spin-orbit torques in the absence of external magnetic fields
- Magnetization switching by spin-orbit torque in an antiferromagnet/ferromagnet bilayer system
- Control of spin-orbit torques through crystal symmetry in WTe2/ferromagnet bilayers
- Evidence for reversible control of magnetization in a ferromagnetic material via spin-orbit magnetic field
- STM imaging of electronic waves on the surface of BiTe: topologically protected surface states and hexagonal warping effects
- Spin-orbit torques induced by interface-generated spin currents
- Observation of spin splitting torque in a collinear antiferromagnet RuO2
- Tilted spin current generated by the collinear antiferromagnet RuO2
- Magnetic oscillations driven by the spin Hall effect in 3-terminal magnetic tunnel junction devices
- Switching of Perpendicularly Polarized Nanomagnets with Spin Orbit Torque without an External Magnetic Field by Engineering a Tilted Anisotropy
- Spin-polarized current in non-collinear antiferromagnets
- Interface-generated spin currents
- Controlling spin current polarization through non-collinear antiferromagnetism
- Spin-orbit torques in locally and globally non-centrosymmetric crystals: Antiferromagnets and ferromagnets
- Thickness dependence of spin-orbit torques generated by WTe2
- Current Control of Magnetism in Two-Dimensional Fe3GeTe2
- Spin-orbit torques in NbSe/Permalloy bilayers
- Swapping of spin currents: interchanging spin and flow directions
- Room-temperature spin-orbit torque in NiMnSb
- Gigantic current control of coercive field and magnetic memory based on nm-thin ferromagnetic van der Waals Fe3GeTe2
- Spin Hall effect emerging from a chiral magnetic lattice without spin-orbit coupling
- Spin Swapping Transport and Torques in Ultrathin Magnetic Bilayers
- Spin Hall and spin swapping torques in diffusive ferromagnets
- Observation of anomalous spin-torque generated by a ferromagnet
- A new decomposition of the Kubo-Bastin formula
- Unconventional spin-orbit torque in transition metal dichalcogenide/ferromagnet bilayers from first-principles calculations
- Elusive Dzyaloshinskii-Moriya interaction in FeGeTe monolayer
- Robust spin-transfer torque and magnetoresistance in non-collinear antiferromagnetic junctions
- Theory of current-driven dynamics of spin textures on a surface of topological insulators
- Janus Monolayers of Magnetic Transition Metal Dichalcogenides as an All-in-One Platform for Spin-Orbit Torque
- Non-linear antidamping spin-orbit torque originating from intra-band transport on the warped surface of a topological insulator