Surface state dominated spin-charge current conversion in topological insulator/ferromagnetic insulator heterostructures

Abstract

We report the observation of ferromagnetic resonance-driven spin pumping signals at room temperature in three-dimensional topological insulator thin films -- Bi2Se3 and (Bi,Sb)2Te3 -- deposited by molecular beam epitaxy on yttrium iron garnet thin films. By systematically varying the Bi2Se3 film thickness, we show that the spin-charge conversion efficiency, characterized by the inverse Rashba-Edelstein effect length (lambda_IREE), increases dramatically as the film thickness is increased from 2 quintuple layers, saturating above 6 quintuple layers. This suggests a dominant role of surface states in spin and charge interconversion in topological insulator/ferromagnet heterostructures. Our conclusion is further corroborated by studying a series of YIG/(BiSb)2Te3 heterostructures. Finally, we use the ferromagnetic resonance linewidth broadening and the inverse Rashba-Edelstein signals to determine the effective interfacial spin mixing conductance and lambda_IREE.

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• 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
• Large spin-to-charge conversion at room temperature in extended epitaxial Sb2Te3 topological insulator chemically grown on Silicon
• Manipulation of coupling and magnon transport in magnetic metal-insulator hybrid structures
• 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
• Highly efficient spin-to-charge current conversion at room temperature in strained HgTe surface states
• Direct detection of induced magnetic moment and efficient spin-to-charge conversion in graphene/ferromagnetic structures
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• Observation of Interfacial Antiferromagnetic Coupling between Magnetic Topological Insulator and Antiferromagnetic Insulator
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• Large unidirectional spin Hall and Rashba-Edelstein magnetoresistance in topological insulator/magnetic insulator heterostructures
• Spin-orbit readout using thin films of topological insulator Sb2Te3 deposited by industrial magnetron sputtering
• Ferromagnetic Resonance Studies of Strain tuned Bi:YIG Films
• Bulk and surface spin conductivity in topological insulators with hexagonal warping
• Unveiling the polarity of the spin-to-charge current conversion in $B{i}_{2}S{e}_3$
• Spin absorption at ferromagnetic-metal/platinum-oxide interface
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• All-electrical Magnon Transport Experiments in Magnetically Ordered Insulators
• Topological insulator Bi2Se3 films on rare earth iron garnets and their high-quality interfaces
• Spin-orbitronics at a topological insulator-semiconductor interface
• Anomalous Nonlocal Resistance and Spin-charge Conversion Mechanisms in Two-Dimensional Metals
• Transmission Line Model for Materials with Spin-Momentum Locking
• Hexagonal Warping Induced Nonlinear Planar Nernst Effect in Nonmagnetic Topological Insulators
• Giant spin torque efficiency in naturally oxidized polycrystalline TaAs thin films
• Electrical control of spin mixing conductance in a Y${}_3$Fe${}_5$O${}_{12}$/Platinum bilayer
• Spin-Hall effect due to the bulk states of topological insulators: Extrinsic contribution to the conserved spin current
• Large-scale defects hidden inside a topological insulator grown onto a 2D substrate
• Spin-Orbit-Torque Field-Effect Transistor (SOTFET): Proposal for a New Magnetoelectric Memory
• Spin transfer torques due to the bulk states of topological insulators
• Large spin to charge conversion in topological superconductor \b{eta}-PdBi2 at room temperature
• Unified Framework for Charge-Spin Interconversion in Spin-Orbit Materials
• Structure, phase stability, half-metallicity, and fully spin-polarized Weyl states in compound NaV2O4: a new example for topological spintronic material
• Edelstein and inverse Edelstein effects caused by the pristine surface states of topological insulators
• Dynamical spin-to-charge conversion on the edge of quantum spin Hall insulator
• Theory of inverse Rashba-Edelstein effect induced by spin pumping into a two-dimensional electron gas
• Spin torque and persistent currents caused by percolation of topological surface states
• Unidirectional spin Hall magnetoresistance in topological insulator/ferromagnetic layer heterostructures
• Spin-polarization of topological crystalline and normal insulator Pb${}_{1-x}$Sn${}_x$Se (111) epilayers probed by photoelectron spectroscopy
• Conduction of surface electrons in a topological insulator with spatially random magnetization
• Spin-to-charge conversion by spin pumping in sputtered polycrystalline Bi${}_x$Se${}_{1-x}$
• Thin film growth of the Weyl semimetal NbAs
• Topological antiferromagnetic spintronics: Part of a collection of reviews on antiferromagnetic spintronics
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