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

Zoltán Kovács-Krausz, Anamul Md Hoque, Péter Makk, Bálint Szentpéteri, Mátyás Kocsis, Bálint Fülöp, Michael Vasilievich Yakushev, Tatyana Vladimirovna Kuznetsova, Oleg Evgenevich Tereshchenko, Konstantin Aleksandrovich Kokh, István Endre Lukács, Takashi Taniguchi, Kenji Watanabe, Saroj Prasad Dash, Szabolcs Csonka

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

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. Because of 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.

Original languageEnglish
Pages (from-to)4782-4791
Number of pages10
JournalNano Letters
Volume20
Issue number7
DOIs
Publication statusPublished - 8 Jul 2020

Keywords

  • 2D materials
  • all-electric spin control
  • graphene
  • nonlocal spin valve
  • polar semiconductors
  • Rashba-Edelstein effect
  • Spintronics

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