Non-equilibrium spin density and spin-orbit torque in three dimensional topological insulators - antiferromagnet heterostructure

Abstract

We study the behavior of non-equilibrium spin density and spin-orbit torque in a topological insulator - antiferromagnet heterostructure. Unlike ferromagnetic heterostructures where Dirac cone is gapped due to time-reversal symmetry breaking, here the Dirac cone is preserved. We demonstrate the existence of a staggered spin density corresponding to a damping like torque, which is quite robust against the scalar impurity, when the transport energy is in the topological insulator surface energy regime. We show the contribution to the non-equilibrium spin density due to both surface and bulk topological insulator bands. Finally, we show that the torques in topological insulator-antiferromagnet heterostructure exhibit an angular dependence that is consistent with the standard spin-orbit torque obtained in Rashba system with some additional nonlinear effects arising from the interfacial coupling.

9 pages, 11 figures

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Cited by in corpus (9)

• A new decomposition of the Kubo-Bastin formula
• Semi-realistic tight-binding model for spin-orbit torques
• Spin-orbit torques in a Rashba honeycomb antiferromagnet
• Classical and quantum machine learning applications in spintronics
• Ultrafast optical generation of antiferromagnetic meron-antimeron pairs with conservation of topological charge
• Intrinsic Orbital Origin for the Chirality-Dependent Nonlinear Planar Hall Effect of Topological Nodal Fermions in Chiral Crystals
• Microscopic origin of scalar potential induced topological transition in massive Dirac fermions and scalar Hall effect
• Spin Wave Generation via Localized Spin-Orbit Torque in an Antiferromagnet-Topological Insulator Heterostructure
• Anisotropy of the spin Hall effect in a Dirac ferromagnet