Large Anomalous Hall Effect in Topological Insulators with Proximitized Ferromagnetic Insulators

Abstract

We report a proximity-driven large anomalous Hall effect in all-telluride heterostructures consisting of ferromagnetic insulator Cr2Ge2Te6 and topological insulator (Bi,Sb)2Te3. Despite small magnetization in the (Bi,Sb)2Te3 layer, the anomalous Hall conductivity reaches a large value of 0.2e2/h in accord with a ferromagnetic response of the Cr2Ge2Te6. The results show that the exchange coupling between the surface state of the topological insulator and the proximitized Cr2Ge2Te6 layer is effective and strong enough to open the sizable exchange gap in the surface state.

33 pages, 12 figures including supplemental material, accepted by PRL

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• Topological Insulators
• Topological insulators and superconductors
• Discovery of intrinsic ferromagnetism in 2D van der Waals crystals
• Anomalous Hall effect
• Experimental Observation of the Quantum Anomalous Hall Effect in a Magnetic Topological Insulator
• Topological Field Theory of Time-Reversal Invariant Insulators
• Quantized Anomalous Hall Effect in Magnetic Topological Insulators
• High-precision realization of robust quantum anomalous Hall state in a hard ferromagnetic topological insulator
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• Realization of the Axion Insulator State in Quantum Anomalous Hall Sandwich Heterostructures
• Magnetic modulation doping in topological insulators toward higher-temperature quantum anomalous Hall effect
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• Imaging Dirac-Mass Disorder from Magnetic Dopant-Atoms in the Ferromagnetic Topological Insulator Cr${}_x$(Bi${}_{0.1}$Sb${}_{0.9}$)${}_{2-x}$Te${}_3$
• Highly-ordered wide bandgap materials for quantized anomalous Hall and magnetoelectric effects
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• Growth and Characterization of Hybrid Insulating Ferromagnet-Topological Insulator Heterostructure Devices
• Magnetic proximity effect in the 3D topological insulator/ferromagnetic insulator heterostructure
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Cited by in corpus (46)

• Colloquium: Quantum anomalous Hall effect
• Transport in two-dimensional topological materials: recent developments in experiment and theory
• Origin of the Magnetic Spin Hall Effect: Spin Current Vorticity in the Fermi Sea
• Topological Hall Effect in a Topological Insulator Interfaced with a Magnetic Insulator
• Intrinsic quantum anomalous Hall phase induced by proximity in germanene/Cr${}_2$Ge${}_2$Te${}_6$ van der Waals heterostructure
• Progress and prospects in the quantum anomalous Hall effect
• Absence of magnetic-proximity effect at the interface of Bi${}_2$Se${}_3$ and (Bi,Sb)${}_2$Te${}_3$ with EuS
• Magnetic Anisotropy in Two-dimensional van der Waals Magnetic Materials and Their Heterostructures: Importance, Mechanisms, and Opportunities
• Realization of the Chern insulator and Axion insulator phases in antiferromagnetic $MnTe$-$B{i}_2(Se,Te{)}_3$-$MnTe$ heterostructures
• Elucidating proximity magnetism through polarized neutron reflectometry and machine learning
• Observation of nonlinear planar Hall effect in magnetic insulator/topological insulator heterostructures
• Second-Order Topological Insulator in van der Waals Heterostructures of CoBr${}_2$/Pt${}_2$HgSe${}_3$/CoBr${}_2$
• Non-local sidewall response and deviation from exact quantization of the topological magnetoelectric effect in axion-insulator thin films
• Polaronic Conductivity in Cr${}_2$Ge${}_2$Te${}_6$ Single Crystals
• Hinge Spin Polarization in Magnetic Topological Insulators Revealed by Resistance Switch
• Ferromagnetic phase transition in topological crystalline insulator thin films: interplay of anomalous Hall angle and magnetic anisotropy
• High temperature, gate-free quantum anomalous Hall effect with an active capping layer
• Tuning the Curie temperature of a 2D magnet/topological insulator heterostructure to above room temperature by epitaxial growth
• Two-dimensional ferromagnetic extension of a topological insulator
• Gate-tunable anomalous Hall effect in a 3D topological insulator/2D magnet van der Waals heterostructure
• Voltage-driven Magnetization Switching via Dirac Magnetic Anisotropy and Spin--orbit Torque in Topological-insulator-based Magnetic Heterostructures
• Magnetic Order in 3D Topological Insulators -- Wishful Thinking or Gateway to Emergent Quantum Effects?
• Suppressing carrier density in (BixSb1-x)2Te3 films using Cr2O3 interfacial layers
• Spin filtering effect in intrinsic 2D magnetic semiconductor Cr2Ge2Te6
• Magnetic Proximity Effect in an Antiferromagnetic Insulator/Topological Insulator Heterostructure with Sharp Interface
• Chemical Migration and Dipole Formation at van der Waals Interfaces between Magnetic Transition Metal Chalcogenides and Topological Insulators
• Chiral Hall effect in the kink states in topological insulators with magnetic domain walls
• Universally optimizable strategy for magnetic gaps towards high-temperature quantum anomalous Hall states via magnetic-insulator/topological-insulator building-blocks
• Voltage-control of damping constant in magnetic-insulator/topological-insulator bilayers
• Strong spin-dephasing in a topological insulator - paramagnet heterostructure
• Topological Insulators-Based Magnetic Heterostructure
• From classical to quantum regime of topological surface states via defect engineering
• Conserved laws and dynamical structure of axions coupled to photons
• Modulation of Dirac electrons in epitaxial Bi2Se3 ultrathin films on van-der-Waals ferromagnet Cr2Si2Te6
• Interplay between exchange split Dirac and Rashba-type surface states in MnBi${}_2$Te${}_4$/BiTeI interface
• Capacitive scheme to detect the topological magnetoelectric effect
• The anomalous Hall Effect in a Magnetically Extended Topological Insulator Heterostructure
• Bi${}_2$Se${}_3$ thin films heteroepitaxially grown on $\alpha$-RuCl${}_3$
• Quantum Anomalous Hall Effect in Three-dimensional Topological Insulator/Thin-film Ferromagnetic Metal Bilayer Structure
• Numerical analysis of voltage-controlled magnetization switching operation in magnetic-topological-insulator-based devices
• Thermoelectric refrigerator based on asymmetric surfaces of a magnetic topological insulator
• Berezinskii-Kosterlitz-Thouless transitions in a topological superconductor-ferromagnet-superconductor junction
• Unconventional enhancement of anomalous Hall effect by tilt of Zeeman field in topologically-nontrivial MXenes, $M_2{M}^{\prime }$C${}_2$O${}_2$
• Dimension-Dependent Critical Scaling Analysis and Emergent Competing Interaction Scales in a 2D Van der Waals magnet Cr${}_2$Ge${}_2$Te${}_6$
• Strain-Mediated Lattice Reconstruction Enhances Ferromagnetism in Cr2Ge2Te6/WTe2 van der Waals Heterobilayers
• Gate-tunable anomalous Hall effect in stacked van der Waals ferromagnetic insulator - topological insulator heterostructures