Dirac-Electrons-Mediated Magnetic Proximity Effect in Topological Insulator / Magnetic Insulator Heterostructures

Abstract

The possible realization of dissipationless chiral edge current in a topological insulator / magnetic insulator heterostructure is based on the condition that the magnetic proximity exchange coupling at the interface is dominated by the Dirac surface states of the topological insulator. Here we report a polarized neutron reflectometry observation of Dirac electrons mediated magnetic proximity effect in a bulk-insulating topological insulator (Bi${}_{0.2}$Sb${}_{0.8}$)${}_2$Te${}_3$ / magnetic insulator EuS heterostructure. We are able to maximize the proximity induced magnetism by applying an electrical back gate to tune the Fermi level of topological insulator to be close to the charge neutral point. A phenomenological model based on diamagnetic screening is developed to explain the suppressed proximity induced magnetism at high carrier density. Our work paves the way to utilize the magnetic proximity effect at the topological insulator/magnetic insulator hetero-interface for low-power spintronic applications.

arXiv comment5 pages main text with 4 figures; 2 pages supplemental materials; suggestions and discussions are welcomed

References in corpus (29)

• Topological Insulators
• Experimental Observation of the Quantum Anomalous Hall Effect in a Magnetic Topological Insulator
• Quantized Anomalous Hall Effect in Magnetic Topological Insulators
• Spin Transfer Torque Generated by the Topological Insulator Bi_2Se_3
• High-precision realization of robust quantum anomalous Hall state in a hard ferromagnetic topological insulator
• Trajectory of Anomalous Hall Effect toward the Quantized State in a Ferromagnetic Topological Insulator
• Gate-Voltage Control of Chemical Potential and Weak Anti-localization in Bismuth Selenide
• Scale-Invariant Dissipationless Chiral Transport in Magnetic Topological Insulators beyond the Two-Dimensional Limit
• Band structure engineering in (Bi1-xSbx)2Te3 ternary topological insulators
• Impurity effect on weak anti-localization in the topological insulator Bi2Te3
• The development of ferromagnetism in the doped topological insulator Bi2-xMnxTe3
• Strong surface scattering in ultrahigh mobility Bi2Se3 topological insulator crystals
• Surface conduction of topological Dirac electrons in bulk insulating Bi2Se3
• Landau quantization and the thickness limit of topological insulator thin films of Sb2Te3
• Magnetic Proximity Effect as a Pathway to Spintronic Applications of Topological Insulators
• Tailoring Exchange Couplings in Magnetic Topological Insulator/Antiferromagnet Heterostructures
• Magnetic proximity effect at the 3D topological insulator/magnetic insulator interface
• In-plane Magnetization Induced Quantum Anomalous Hall Effect
• Massive Dirac surface states in topological insulator/magnetic insulator heterostructures
• Independent tuning of electronic properties and induced ferromagnetism in topological insulators with heterostructure approach
• Quantum Anomalous Hall Effect in Time-Reversal-Symmetry Breaking Topological Insulators
• Proximity Driven Enhanced Magnetic Order at Ferromagnetic Insulator / Magnetic Topological Insulator Interface
• Experimental Verification of Van Vleck Nature of Long-Range Ferromagnetic Order in Vanadium-Doped Three-Dimensional Topological Insulator Sb${}_2$Te${}_3$
• Spin-transfer torque and spin-polarization in topological-insulator/ferromagnet vertical heterostructures
• Magnetic proximity effect in the 3D topological insulator/ferromagnetic insulator heterostructure
• Magnetic Proximity Effect and Interlayer Exchange Coupling of Ferromagnetic/Topological Insulator/Ferromagnetic Trilayer
• Proximity effect between a topological insulator and a magnetic insulator with large perpendicular anisotropy
• Pure spin current devices based on ferromagnetic topological insulators
• Topological magnetic dipolar interaction and non-local electric magnetization control in topological insulator heterostructures

Cited by in corpus (13)

• Large Anomalous Hall Effect in Topological Insulators with Proximitized Ferromagnetic Insulators
• Unconventional Planar Hall Effect in Exchange-Coupled Topological Insulator-Ferromagnetic Insulator Heterostructures
• 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
• Do topology and ferromagnetism cooperate at the EuS/Bi${}_2$Se${}_3$ interface?
• Signatures of long-range-correlated disorder in the magnetotransport of ultrathin topological insulators
• Observation of nonlinear planar Hall effect in magnetic insulator/topological insulator heterostructures
• Magnetic Order in 3D Topological Insulators -- Wishful Thinking or Gateway to Emergent Quantum Effects?
• In-depth Analysis of Anisotropic Magnetoconductance in Bi${}_2$Se${}_3$ thin films with electron-electron interaction corrections
• Direct probe of ferromagnetic proximity effect at the interface in Fe/SnTe heterostructure by polarized neutron reflectometry
• Formation of bound states from the edge states of 2D topological insulator by macroscopic magnetic barriers
• Discovery of a high-temperature antiferromagnetic state and transport signatures of exchange interactions in a Bi2Se3/EuSe heterostructure
• Carrier Density and Thickness Dependent Proximity Effect in Doped Topological Insulator -- Metallic Ferromagnet Bilayers