Electrically Controlled Spin Injection from Giant Rashba Spin-Orbit Conductor BiTeBr

Abstract

Ferromagnetic materials are the widely used source of spin-polarized electrons in spintronic devices, which are controlled by external magnetic fields or spin-transfer torque methods. However, with increasing demand for smaller and faster spintronic components, utilization of spin-orbit phenomena provides promising alternatives. New materials with unique spin textures are highly desirable since all-electric creation and control of spin polarization is expected, where the strength, as well as an arbitrary orientation of the polarization, can be defined without the use of a magnetic field. In this work, we use a novel spin-orbit crystal BiTeBr for this purpose. Owning to its giant Rashba spin splitting, bulk spin polarization is created at room temperature by an electric current. Integrating BiTeBr crystal into graphene-based spin valve devices, we demonstrate for the first time that it acts as a current-controlled spin injector, opening new avenues for future spintronic applications in integrated circuits.

Main Text: 10 pages, 5 figures; Supporting Information: 12 pages, 6 figures

References in corpus (21)

• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Signatures of Majorana fermions in hybrid superconductor-semiconductor nanowire devices
• Graphene Spintronics
• Emergent Phenomena Induced by Spin-Orbit Coupling at Surfaces and Interfaces
• The Quantum Spin Hall Effect: Theory and Experiment
• Spin-Orbit Proximity Effect in Graphene
• Highly efficient and tuneable spin-to-charge conversion through Rashba coupling at oxide interfaces
• Tunneling Spin Injection into Single Layer Graphene
• Tunneling Spin Injection into Single Layer Graphene (Supplementary Information)
• Prospects for Spin-Based Quantum Computing
• Strongly spin-orbit coupled two-dimensional electron gas emerging near the surface of polar semiconductors
• Nanosecond spin lifetimes in single- and few-layer graphene-hBN heterostructures at room temperature
• Rashba-Edelstein Magnetoresistance in Metallic Heterostructure
• Optimal charge-to-spin conversion in graphene on transition metal dichalcogenides
• Spin Hall effect and Weak Antilocalization in Graphene/Transition Metal Dichalcogenide Heterostructures
• Optospintronics in graphene via proximity coupling
• Optical properties of BiTeBr and BiTeCl
• Effect of contacts on spin lifetime measurements in graphene
• Pressure effects on crystal and electronic structure of bismuth tellurohalides
• Crystal growth and electronic properties of a 3D Rashba material, BiTeI, with adjusted carrier concentrations
• BiTeCl and BiTeBr: a comparative high-pressure optical study