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

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, András Kovács, Amit Kohn

University of Plymouth

Research output: Contribution to journal › Journal article › Research › peer-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 language	English
Journal	Applied Physics Letters
Volume	96
Issue number	22
Pages (from-to)	222503
ISSN	0003-6951
DOIs	https://doi.org/10.1063/1.3442480
Publication status	Published - 2010

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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 Andr{\'a}s Kov{\'a}cs and Amit Kohn",

year = "2010",

doi = "10.1063/1.3442480",

language = "English",

volume = "96",

pages = "222503",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics",

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TY - JOUR

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 - Kovács, András

AU - Kohn, Amit

PY - 2010

Y1 - 2010

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.

U2 - 10.1063/1.3442480

DO - 10.1063/1.3442480

M3 - Journal article

SN - 0003-6951

VL - 96

SP - 222503

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 22

ER -

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

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