Spin injection and detection in a graphene lateral spin valve using an yttrium-oxide tunneling barrier

Katsuyoshi Komatsu, Shinya Kasai, Song Lin Li, Shu Nakaharai, Nobuhiko Mitoma, Mahito Yamamoto, Kazuhito Tsukagoshi

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

We demonstrate charge and spin current transport in a graphene-based lateral spin valve using yttrium oxide (Y-O) as a tunneling barrier between graphene and a ferromagnetic electrode. A Y-O layer grown on graphene is flat, with a root-mean-square roughness of 0.17 nm, which is much lower than that of conventional barrier materials. This flatness allows the utilization of a very thin but well-defined tunneling barrier, leading to a large spin signal of ~20ω and a high spin injection efficiency of 15% with a low contact resistance of ~1kω. These findings represent important progress toward the realization of graphene-based spintronics applications.

Original languageEnglish
Article number085101
JournalApplied Physics Express
Volume7
Issue number8
DOIs
Publication statusPublished - 2014 Aug
Externally publishedYes

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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