Surface morphology of epitaxial magnetic tunnel junctions

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

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


The surface morphology of epitaxial Fe(001)/MgO(001)/Fe(001) magnetic tunnel junctions, which show the giant tunneling magnetoresistance effect, was investigated by in situ scanning tunneling microscopy. It was observed that an epitaxial MgO barrier layer forms flat surface structures. The surface was flatter with distinct steps and terraces after annealing, which would lead to an increase of the tunneling magnetoresistance ratio. Examination of the local electronic structures of 1.05-nm-thick MgO barrier layers by scanning tunneling spectroscopy revealed no pinholes in the layers, so they would be perfect barriers in magnetic tunnel junctions.

Original languageEnglish
Pages (from-to)255-258
Number of pages4
JournalJournal of Nanoscience and Nanotechnology
Issue number1
Publication statusPublished - 2007 Jan 1
Externally publishedYes


  • Magnesium Oxide
  • Magnetic Random Access Momory
  • Magnetic Tunnel Junction
  • Scanning Tunneling Microscopy
  • Tunneling Magnetoresistance

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics


Dive into the research topics of 'Surface morphology of epitaxial magnetic tunnel junctions'. Together they form a unique fingerprint.

Cite this