Improved thermal stability of exchange bias of Mn-Ir/Co-Fe bilayers by novel in situ thermal annealing procedure

Ken Ichi Imakita, Masakiyo Tsunoda, Migaku Takahashi

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

The effect of in situ thermal annealing of Mn-Ir films under ultra-high vacuum on the metallurgical microstructure and on the thermal stability of the unidirectional anisotropy constant, J K, was investigated for Mn 73Ir 27/Co 70Fe 30 bilayers. As a result, we found that the average lateral grain size of Mn-Ir increases with increasing the in situ annealing temperature, T IR and that the shape of J K-T curve changes to convex with increasing the T IR, implying a narrowing distribution of local blocking temperature. We conclude that ultra-high vacuum annealing is effective in improving the thermal stability of the exchange anisotropy of Mn-Ir/Co-Fe bilayers through the change of lateral grain size distribution of the Mn-Ir layer.

Original languageEnglish
Pages (from-to)248-252
Number of pages5
JournalJournal of Magnetism and Magnetic Materials
Volume286
Issue numberSPEC. ISS.
DOIs
Publication statusPublished - 2005 Feb

Keywords

  • Exchange anisotropy
  • Lateral grain growth
  • Local blocking temperature
  • Mn-Ir
  • Thermal stability

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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