Electrically tunable spin injector free from the impedance mismatch problem

Kazuya Ando, S. Takahashi, J. Ieda, H. Kurebayashi, T. Trypiniotis, C. H W Barnes, S. Maekawa, E. Saitoh

Research output: Contribution to journalArticle

189 Citations (Scopus)

Abstract

Injection of spin currents into solids is crucial for exploring spin physics and spintronics. There has been significant progress in recent years in spin injection into high-resistivity materials, for example, semiconductors and organic materials, which uses tunnel barriers to circumvent the impedance mismatch problem; the impedance mismatch between ferromagnetic metals and high-resistivity materials drastically limits the spin-injection efficiency. However, because of this problem, there is no route for spin injection into these materials through low-resistivity interfaces, that is, Ohmic contacts, even though this promises an easy and versatile pathway for spin injection without the need for growing high-quality tunnel barriers. Here we show experimental evidence that spin pumping enables spin injection free from this condition; room-temperature spin injection into GaAs from Ni 81 Fe 19 through an Ohmic contact is demonstrated through dynamical spin exchange. Furthermore, we demonstrate that this exchange can be controlled electrically by applying a bias voltage across a Ni 81 Fe 19/GaAs interface, enabling electric tuning of the spin-pumping efficiency.

Original languageEnglish
Pages (from-to)655-659
Number of pages5
JournalNature Materials
Volume10
Issue number9
DOIs
Publication statusPublished - 2011 Sep
Externally publishedYes

Fingerprint

injectors
impedance
Ohmic contacts
injection
Tunnels
Magnetoelectronics
Ferromagnetic materials
Bias voltage
Physics
Tuning
electrical resistivity
tunnels
Semiconductor materials
electric contacts
pumping
spin exchange
organic materials
Temperature
tuning
routes

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Condensed Matter Physics
  • Materials Science(all)
  • Chemistry(all)

Cite this

Ando, K., Takahashi, S., Ieda, J., Kurebayashi, H., Trypiniotis, T., Barnes, C. H. W., ... Saitoh, E. (2011). Electrically tunable spin injector free from the impedance mismatch problem. Nature Materials, 10(9), 655-659. https://doi.org/10.1038/nmat3052

Electrically tunable spin injector free from the impedance mismatch problem. / Ando, Kazuya; Takahashi, S.; Ieda, J.; Kurebayashi, H.; Trypiniotis, T.; Barnes, C. H W; Maekawa, S.; Saitoh, E.

In: Nature Materials, Vol. 10, No. 9, 09.2011, p. 655-659.

Research output: Contribution to journalArticle

Ando, K, Takahashi, S, Ieda, J, Kurebayashi, H, Trypiniotis, T, Barnes, CHW, Maekawa, S & Saitoh, E 2011, 'Electrically tunable spin injector free from the impedance mismatch problem', Nature Materials, vol. 10, no. 9, pp. 655-659. https://doi.org/10.1038/nmat3052
Ando K, Takahashi S, Ieda J, Kurebayashi H, Trypiniotis T, Barnes CHW et al. Electrically tunable spin injector free from the impedance mismatch problem. Nature Materials. 2011 Sep;10(9):655-659. https://doi.org/10.1038/nmat3052
Ando, Kazuya ; Takahashi, S. ; Ieda, J. ; Kurebayashi, H. ; Trypiniotis, T. ; Barnes, C. H W ; Maekawa, S. ; Saitoh, E. / Electrically tunable spin injector free from the impedance mismatch problem. In: Nature Materials. 2011 ; Vol. 10, No. 9. pp. 655-659.
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