Giant spin Hall effect in graphene grown by chemical vapour deposition

Jayakumar Balakrishnan, Gavin Kok Wai Koon, Ahmet Avsar, Yuda Ho, Jong Hak Lee, Manu Jaiswal, Seung Jae Baeck, Jong Hyun Ahn, Aires Ferreira, Miguel A. Cazalilla, Antonio H.Castro Neto, Barbaros Özyilmaz

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Advances in large-area graphene synthesis via chemical vapour deposition on metals like copper were instrumental in the demonstration of graphene-based novel, wafer-scale electronic circuits and proof-of-concept applications such as flexible touch panels. Here, we show that graphene grown by chemical vapour deposition on copper is equally promising for spintronics applications. In contrast to natural graphene, our experiments demonstrate that chemically synthesized graphene has a strong spin-orbit coupling as high as 20â ‰meV giving rise to a giant spin Hall effect. The exceptionally large spin Hall angle ∼0.2 provides an important step towards graphene-based spintronics devices within existing complementary metal-oxide-semiconductor technology. Our microscopic model shows that unavoidable residual copper adatom clusters act as local spin-orbit scatterers and, in the resonant scattering limit, induce transverse spin currents with enhanced skew-scattering contribution. Our findings are confirmed independently by introducing metallic adatoms-copper, silver and gold on exfoliated graphene samples.

Original languageEnglish
Article number4748
JournalNature communications
Publication statusPublished - 2014 Sep 1

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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    Balakrishnan, J., Koon, G. K. W., Avsar, A., Ho, Y., Lee, J. H., Jaiswal, M., Baeck, S. J., Ahn, J. H., Ferreira, A., Cazalilla, M. A., Neto, A. H. C., & Özyilmaz, B. (2014). Giant spin Hall effect in graphene grown by chemical vapour deposition. Nature communications, 5, [4748].