Influence of crystal structure and oxygen content on exchange-coupling properties of IrMn/CoFe spin-valve films

Hiromi N. Fuke, Kazuhiro Saito, Masatoshi Yoshikawa, Hitoshi Iwasaki, Masashi Sahashi

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)

Abstract

Investigations were made into the relationship between the exchange-coupling properties and the IrMn crystal grain size for CoFe/IrMn spin valves. The IrMn crystal grain size increased with increasing thickness and decreasing oxygen content of the IrMn layer. The increase in the IrMn grain size resulted in a higher blocking temperature (TB) but a lower unidirectional anisotropy field (HUA). This opposite dependence of TB and HUA on the IrMn grain size is different from those of other antiferromagnetic films such as FeMn, NiMn, and CrMnPt. An HUA of 400 Oe at room temperature and a TB of 300°C are obtained for CoFe (2 nm)/IrMn (10 nm) spin valves by controlling the oxygen content of the IrMn layer.

Original languageEnglish
Pages (from-to)3680-3682
Number of pages3
JournalApplied Physics Letters
Volume75
Issue number23
DOIs
Publication statusPublished - 1999 Dec 6

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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