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

Yuqing Du; Genhua Pan; Roy Moate; Hendrik Ohldag; Andras Kovacs; Amit Kohn

doi:10.1063/1.3442480

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

Yuqing Du^*, Genhua Pan, Roy Moate, Hendrik Ohldag, Andras Kovacs, Amit Kohn

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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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 J_k was observed.

Original language	English
Article number	222503
Journal	Applied Physics Letters
Volume	96
Issue number	22
DOIs	https://doi.org/10.1063/1.3442480
State	Published - 31 May 2010
Externally published	Yes

Funding

Funders	Funder number
Engineering and Physical Sciences Research Council	EP/F016174/1

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title = "Enhanced exchange anisotropy in IrMn/CoFeB systems and its correlation with uncompensated interfacial spins",

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.",

author = "Yuqing Du and Genhua Pan and Roy Moate and Hendrik Ohldag and Andras Kovacs and Amit Kohn",

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T1 - Enhanced exchange anisotropy in IrMn/CoFeB systems and its correlation with uncompensated interfacial spins

AU - Du, Yuqing

AU - Pan, Genhua

AU - Moate, Roy

AU - Ohldag, Hendrik

AU - Kovacs, Andras

AU - Kohn, Amit

PY - 2010/5/31

Y1 - 2010/5/31

N2 - 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.

AB - 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.

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

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