Magnetic properties of exchange-biased [Co/Pt]n multilayer with perpendicular magnetic anisotropy

Jun Yang Chen; Jia Feng Feng; Zhu Diao; Gen Feng; J. M.D. Coey; Xiu Feng Han

doi:10.1109/TMAG.2010.2041192

Magnetic properties of exchange-biased [Co/Pt]_n multilayer with perpendicular magnetic anisotropy

Jun Yang Chen, Jia Feng Feng, Zhu Diao, Gen Feng, J. M.D. Coey, Xiu Feng Han

Electrical and Computer Engineering

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

16 Scopus citations

Abstract

Perpendicular exchange-biased [Co/Pt]₃Co(t_Co)IrMn and IrMn/Co(t_co)/Pt/[Co/Pt]₃multilayers have been fabricated, changing the thickness (t_Co)of the cobalt that is next to the IrMn layer. The crystal structure, interface roughness and magnetic properties were characterized by X-ray diffraction (XRD), X-ray reflectivity (XRR), atomic force microscopy (AFM) and extraordinary Hall Effect (EHE). The multilayers are flat, and the roughness is about 0.2 nm across the 2-μm scanning range. The magnetization reversal is dependent on t_Co, and the exchange bias and coercivity vary with t_Co. The exchange bias reaches a maximum value (about 13.9 mT) for top-pinned multilayers at t_Co=0.45 nm, while it reaches a maximum (about 3.5 mT) for bottom-pinned multilayers at t _Co=0.6 nm. For both stacks the coercivity is maximum (about 30 mT) at t_Co=0.8nm, and stable for t_Co>1.0nm. These results are well understood in terms of the Co spin orientation at the Co/IrMn interface.

Original language	English (US)
Article number	5467500
Pages (from-to)	1401-1404
Number of pages	4
Journal	IEEE Transactions on Magnetics
Volume	46
Issue number	6
DOIs	https://doi.org/10.1109/TMAG.2010.2041192
State	Published - Jun 2010

Bibliographical note

Funding Information:
This work was supported by Science Foundation Ireland as part of MANSE project, and by the Ireland-China Scientific Exchange Scheme. The authors are also grateful for the partial support of the State Key Project of Fundamental Research, Ministry of Science and Technology (MOST), under Grant 2006CB932200, Chinese National Natural Science Foundation (NSFC), under Grants 10574156, 50528101 and 50721001, and Ireland-China Joint Research Project between SFI and MOST.

Keywords

Magnetization reversal
[Co/Pt] perpendicular multilayers

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@article{b4f70c8dcfb844dca495d1ddda6721f0,

title = "Magnetic properties of exchange-biased [Co/Pt]n multilayer with perpendicular magnetic anisotropy",

abstract = "Perpendicular exchange-biased [Co/Pt]3Co(tCo)IrMn and IrMn/Co(tco)/Pt/[Co/Pt]3multilayers have been fabricated, changing the thickness (tCo)of the cobalt that is next to the IrMn layer. The crystal structure, interface roughness and magnetic properties were characterized by X-ray diffraction (XRD), X-ray reflectivity (XRR), atomic force microscopy (AFM) and extraordinary Hall Effect (EHE). The multilayers are flat, and the roughness is about 0.2 nm across the 2-μm scanning range. The magnetization reversal is dependent on tCo, and the exchange bias and coercivity vary with tCo. The exchange bias reaches a maximum value (about 13.9 mT) for top-pinned multilayers at tCo=0.45 nm, while it reaches a maximum (about 3.5 mT) for bottom-pinned multilayers at t Co=0.6 nm. For both stacks the coercivity is maximum (about 30 mT) at tCo=0.8nm, and stable for tCo>1.0nm. These results are well understood in terms of the Co spin orientation at the Co/IrMn interface.",

keywords = "Magnetization reversal, [Co/Pt] perpendicular multilayers",

author = "Chen, {Jun Yang} and Feng, {Jia Feng} and Zhu Diao and Gen Feng and Coey, {J. M.D.} and Han, {Xiu Feng}",

note = "Funding Information: This work was supported by Science Foundation Ireland as part of MANSE project, and by the Ireland-China Scientific Exchange Scheme. The authors are also grateful for the partial support of the State Key Project of Fundamental Research, Ministry of Science and Technology (MOST), under Grant 2006CB932200, Chinese National Natural Science Foundation (NSFC), under Grants 10574156, 50528101 and 50721001, and Ireland-China Joint Research Project between SFI and MOST.",

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AU - Feng, Gen

AU - Coey, J. M.D.

AU - Han, Xiu Feng

N1 - Funding Information: This work was supported by Science Foundation Ireland as part of MANSE project, and by the Ireland-China Scientific Exchange Scheme. The authors are also grateful for the partial support of the State Key Project of Fundamental Research, Ministry of Science and Technology (MOST), under Grant 2006CB932200, Chinese National Natural Science Foundation (NSFC), under Grants 10574156, 50528101 and 50721001, and Ireland-China Joint Research Project between SFI and MOST.

PY - 2010/6

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N2 - Perpendicular exchange-biased [Co/Pt]3Co(tCo)IrMn and IrMn/Co(tco)/Pt/[Co/Pt]3multilayers have been fabricated, changing the thickness (tCo)of the cobalt that is next to the IrMn layer. The crystal structure, interface roughness and magnetic properties were characterized by X-ray diffraction (XRD), X-ray reflectivity (XRR), atomic force microscopy (AFM) and extraordinary Hall Effect (EHE). The multilayers are flat, and the roughness is about 0.2 nm across the 2-μm scanning range. The magnetization reversal is dependent on tCo, and the exchange bias and coercivity vary with tCo. The exchange bias reaches a maximum value (about 13.9 mT) for top-pinned multilayers at tCo=0.45 nm, while it reaches a maximum (about 3.5 mT) for bottom-pinned multilayers at t Co=0.6 nm. For both stacks the coercivity is maximum (about 30 mT) at tCo=0.8nm, and stable for tCo>1.0nm. These results are well understood in terms of the Co spin orientation at the Co/IrMn interface.

AB - Perpendicular exchange-biased [Co/Pt]3Co(tCo)IrMn and IrMn/Co(tco)/Pt/[Co/Pt]3multilayers have been fabricated, changing the thickness (tCo)of the cobalt that is next to the IrMn layer. The crystal structure, interface roughness and magnetic properties were characterized by X-ray diffraction (XRD), X-ray reflectivity (XRR), atomic force microscopy (AFM) and extraordinary Hall Effect (EHE). The multilayers are flat, and the roughness is about 0.2 nm across the 2-μm scanning range. The magnetization reversal is dependent on tCo, and the exchange bias and coercivity vary with tCo. The exchange bias reaches a maximum value (about 13.9 mT) for top-pinned multilayers at tCo=0.45 nm, while it reaches a maximum (about 3.5 mT) for bottom-pinned multilayers at t Co=0.6 nm. For both stacks the coercivity is maximum (about 30 mT) at tCo=0.8nm, and stable for tCo>1.0nm. These results are well understood in terms of the Co spin orientation at the Co/IrMn interface.

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