Microscopic structures of MgO barrier layers in single-crystal Fe/MgO/Fe magnetic tunnel junctions showing giant tunneling magnetoresistance

Masaki Mizuguchi, Y. Suzuki, T. Nagahama, S. Yuasa

研究成果: Article査読

7 被引用数 (Scopus)

抄録

The microscopic structures of MgO(001) barrier layers in magnetic tunnel junctions showing giant tunneling magnetoresistance were characterized by in situ scanning tunneling microscopy. The MgO thin films formed exceedingly flat surfaces, and their terraces were made even flatter by annealing after deposition. This flattening of MgO surfaces apparently promotes coherent transport of electrons, which should enhance the tunneling magnetoresistance ratio. Local tunneling spectroscopy revealed that an annealed MgO layer has a critical thickness between 3 and 5 ML (monolayer), and a continuous film without pinholes can be formed over the thickness.

本文言語English
論文番号251901
ジャーナルApplied Physics Letters
88
25
DOI
出版ステータスPublished - 2006 6 19
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(その他)

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