Thickness dependence of exchange anisotropy of polycrystalline Mn 3Ir /Co-Fe bilayers

Ken Ichi Imakita, Masakiyo Tsunoda, Migaku Takahashi

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21 Citations (Scopus)

Abstract

The dependence of exchange anisotropy of polycrystalline Mn3IrCo70Fe30 bilayers on the antiferromagnetic layer thickness (dAF) was investigated. The degree of order of a Mn-Ir layer in the examined bilayers was almost constant of 0.45, regardless of dAF. The findings are stated as follows. A maximum unidirectional anisotropy constant (JK) of 1.3 ergcm2 is obtained at dAF=10 nm. The critical thickness of dAF, where JK becomes half of its maximum value, is less than 5 nm and comparable to that of the bilayer with disordered Mn-Ir. The blocking temperature (TB) is enhanced in several-ten degrees with ordering of the Mn-Ir layer.

Original languageEnglish
Article number10K106
JournalJournal of Applied Physics
Volume97
Issue number10
DOIs
Publication statusPublished - 2005 May 15

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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