Spin-dependent tunneling spectroscopy in single-crystal Fe/MgO/Fe tunnel junctions

Y. Ando, T. Miyakoshi, M. Oogane, T. Miyazaki, H. Kubota, K. Ando, S. Yuasa

Research output: Contribution to journalArticlepeer-review

58 Citations (Scopus)

Abstract

We report a detailed spin-dependent tunneling spectroscopy in single-crystal Fe (001) MgO (001) Fe (001) magnetic tunnel junctions (MTJs) that show a giant tunnel magnetoresistance effect. Spectra for antiparallel magnetic configurations show asymmetry because of extrinsic electron scatterings caused by structural defects at the barrier/electrode interfaces. Surprisingly, spectra for parallel magnetic configurations exhibit a complex oscillatory structure that has never been observed in conventional MTJs with an aluminum-oxide tunnel barrier. The complex spectra reflect the tunneling process via interface resonant states. These results provide some information that helps to elucidate the physics of spin-dependent electron tunneling and to further enhance magnetoresistance.

Original languageEnglish
Article number142502
Pages (from-to)1-3
Number of pages3
JournalApplied Physics Letters
Volume87
Issue number14
DOIs
Publication statusPublished - 2005 Oct 3

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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