Abstract：
: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 20 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.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Balakrishnan J,Koon GK,Avsar A,Ho Y,Lee JH,Jaiswal M,Baeck SJ,Ahn JH,Ferreira A,Cazalilla MA,Castro Neto AH,Özyilmaz Bdoi
10.1038/ncomms5748subject
Has Abstractpub_date
2014-09-01 00:00:00pages
4748issn
2041-1723pii
ncomms5748journal_volume
5pub_type
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