Enhanced spin Seebeck effect signal due to spin-momentum locked topological surface states

Abstract

Spin-momentum locking in protected surface states enables efficient electrical detection of magnon decay at a magnetic-insulator/topological-insulator heterojunction. Here we demonstrate this property using the spin Seebeck effect, i.e. measuring the transverse thermoelectric response to a temperature gradient across a thin film of yttrium iron garnet, an insulating ferrimagnet, and forming a heterojunction with (BixSb1-x)2Te3, a topological insulator. The non-equilibrium magnon population established at the interface can decay in part by interactions of magnons with electrons near the Fermi energy of the topological insulator. When this decay channel is made active by tuning (BixSb1-x)2Te3 to a bulk insulator, a large electromotive force emerges in the direction perpendicular to the in-plane magnetization of yttrium iron garnet. The enhanced, tunable spin Seebeck effect which occurs when the Fermi level lies in the bulk gap offers unique advantages over the usual spin Seebeck effect in metals and therefore opens up exciting possibilities in spintronics.

References in corpus (15)

• Topological Insulators
• Topological insulators and superconductors
• Anomalous Hall effect
• 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 Transfer Torque Generated by the Topological Insulator Bi_2Se_3
• Proximity-induced ferromagnetism in graphene revealed by anomalous Hall effect
• Band structure engineering in (Bi1-xSbx)2Te3 ternary topological insulators
• Topological Phase Transition and Texture Inversion in a Tunable Topological Insulator
• Inverse Spin-Galvanic Effect in a Topological-Insulator/Ferromagnet Interface
• Longitudinal Spin Seebeck Effect Free from the Proximity Nernst Effect
• Intrinsic Spin Seebeck Effect in Au/YIG
• Observation of inverse spin Hall effect in bismuth selenide
• Independent tuning of electronic properties and induced ferromagnetism in topological insulators with heterostructure approach
• Spin-Polarized Tunneling Study on Spin-Momentum Locking in the Topological Insulators
• Induced magneto-transport properties at palladium/yttrium iron garnet interface

Cited by in corpus (36)

• Room temperature spin-orbit torque switching induced by a topological insulator
• Spin scattering and noncollinear spin structure-induced intrinsic anomalous Hall effect in antiferromagnetic topological insulator $\mathrm{MnB}{\mathrm{i}}_2\mathrm{T}{\mathrm{e}}_4$
• Surface state dominated spin-charge current conversion in topological insulator/ferromagnetic insulator heterostructures
• Above 400 K Robust Perpendicular Ferromagnetic Phase in a Topological Insulator
• Ultrafast Spin-To-Charge Conversion at the Surface of Topological Insulator Thin Films
• Nonlinear planar Hall effect
• Direct observation of magnon-phonon coupling in yttrium iron garnet
• Strongly exchange-coupled and surface-state-modulated magnetization dynamics in Bi2Se3/YIG heterostructures
• Magnetic-proximity-induced magnetoresistance on topological insulators
• Dirac-Surface-State-Dominated Spin to Charge Current Conversion in the Topological Insulator $(B{i}_{0.22}S{b}_{0.78}{)}_{2}T{e}_3$ Films at Room Temperature
• Systematic Control of Strain-Induced Perpendicular Magnetic Anisotropy in Epitaxial Europium and Terbium Iron Garnets Thin Films
• Tunneling Planar Hall Effect in Topological Insulators: Spin-Valves and Amplifiers
• Spin Injection and Inverse Edelstein Effect in the Surface States of Topological Kondo Insulator SmB6
• Fermi Level Dependent Spin Pumping from a Magnetic Insulator into a Topological Insulator
• Unconventional Planar Hall Effect in Exchange-Coupled Topological Insulator-Ferromagnetic Insulator Heterostructures
• Interface-induced anomalous Nernst effect in Fe3O4/Pt-based heterostructures
• Engineering the breaking of time-reversal symmetry in gate-tunable hybrid ferromagnet/topological insulator heterostructures
• Light and microwave driven spin pumping across FeGaB-BiSb interface
• Microscopic derivation of magnon spin current in a topological insulator/ferromagnet heterostructure
• Spin Seebeck effect and thermal spin galvanic effect in Ni80Fe20/p-Si bilayers
• Topological insulator Bi2Se3 films on rare earth iron garnets and their high-quality interfaces
• Theory of the Spin Seebeck Effect at a Topological-Insulator/Ferromagnetic-Insulator Interface
• Hexagonal Warping Induced Nonlinear Planar Nernst Effect in Nonmagnetic Topological Insulators
• Tuning the diffusion of magnon in Y3Fe5O12 by light excitation
• Preparation of clean surfaces and Se vacancy formation in Bi${}_2$Se${}_3$ by ion bombardment and annealing
• Planar Josephson Hall effect in topological Josephson junctions
• Voltage-control of damping constant in magnetic-insulator/topological-insulator bilayers
• Universally optimizable strategy for magnetic gaps towards high-temperature quantum anomalous Hall states via magnetic-insulator/topological-insulator building-blocks
• Topological Insulators-Based Magnetic Heterostructure
• Nanosecond dynamics in intrinsic topological insulator ${\text{Bi}}_{2-x}{\text{Sb}}_x{\text{Se}}_3$ revealed by time-resolved optical reflectivity
• Giant enhancement in Rashba spin-Seebeck effect in NiFe/p-Si thin films
• The anomalous Hall Effect in a Magnetically Extended Topological Insulator Heterostructure
• Spatial Distribution of Topological Surface State Electrons in Bi${}_2$Te${}_3$ Probed by Low Energy Na${}^{+}$ Ion Scattering
• Spatial Distribution of Topological Surface State Electrons in Bi${}_2$Se${}_3$ Probed by Na${}^{+}$ Low Energy Ion Scattering
• Non-orthogonal Spin-Momentum Locking
• Tracing Dirac points of topological surface states by ferromagnetic resonance