Enhanced exchange anisotropy in IrMn/CoFeB systems and its correlation with uncompensated interfacial spins

Yuqing Du, Genhua Pan, Roy Moate, Hendrik Ohldag, András Kovács, Amit Kohn

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Bottom pinned exchange bias systems of IrMn/CoFe and IrMn/CoFeB on CoFe seed layers were studied. Enhanced exchange anisotropy has been observed for IrMn/CoFeB samples annealed at 350 °C. The ferromagnetic and antiferromagnetic layers of both samples are polycrystalline and textured {110} for the CoFe and CoFeB, and {111} for IrMn. Results demonstrated that the enhanced exchange anisotropy in the IrMn/CoFeB system is closely associated with the increased uncompensated interfacial spins as evidenced by the enhanced Mn x-ray magnetic circular dichroism (XMCD) signal strength. A quantitative correlation between the Mn XMCD signal and the exchange anisotropy constant Jk was observed.
    Original languageEnglish
    JournalApplied Physics Letters
    Volume96
    Issue number22
    Pages (from-to)222503
    ISSN0003-6951
    DOIs
    Publication statusPublished - 2010

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