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Ferromagnetic materials are the widely used source of spin-polarizedelectrons in spintronic devices, which are controlled by external magneticfields or spin-transfer torque methods. However, with increasing demand forsmaller and faster spintronic components, utilization of spin-orbit phenomenaprovides promising alternatives. New materials with unique spin textures arehighly desirable since all-electric creation and control of spin polarizationis expected, where the strength, as well as an arbitrary orientation of thepolarization, 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 giantRashba spin splitting, bulk spin polarization is created at room temperature byan electric current. Integrating BiTeBr crystal into graphene-based spin valvedevices, we demonstrate for the first time that it acts as a current-controlledspin injector, opening new avenues for future spintronic applications inintegrated circuits.

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