Angular dependence of exchange bias and coercive field in CoFe/MnIr epitaxial bilayers

Dong Young Kim; Cheol Gi Kim; Chong Oh Kim; M. Shibata; M. Tsunoda; M. Takahashi

doi:10.1109/TMAG.2005.854762

Angular dependence of exchange bias and coercive field in CoFe/MnIr epitaxial bilayers

Dong Young Kim, Cheol Gi Kim, Chong Oh Kim, M. Shibata, M. Tsunoda, M. Takahashi

Research Center for Green X-Tech

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

13 Citations (Scopus)

Abstract

We have measured the hysteresis loop and torque curves at various applied magnetic field angle in CoFe/MnIr epitaxial bilayers on single crystal MgO (001), (111), and (011) samples. The (001) samples show double shifted magnetization curves, which are dominant as the MnIr thickness increases. It suggests that the unidirectional anisotropy and cubic anisotropy of CoFe (001) layer plays a key role in the formation of double shifted magnetization reversal. The angular variation of exchange bias (Hex) and coercive field (He) depend on the orientation of MgO substrates. The measured results are compared with calculated data, which are fitted using the crystalline anisotropy, unidirectional and uniaxial anisotropy induced by the field annealing. The calculated Hex and Hc as a function of measuring angles show similar trend as the measured ones. Theses energy contributions play an essential role in the angle dependent magnetization process in epitaxial CoFe/MnIr bilayers.

Original language	English
Pages (from-to)	2712-2714
Number of pages	3
Journal	IEEE Transactions on Magnetics
Volume	41
Issue number	10
DOIs	https://doi.org/10.1109/TMAG.2005.854762
Publication status	Published - 2005 Oct

Keywords

Crystalline anisotropy
Domain pattern
Epitaxial bilayer
Exchange bias and coercive field

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title = "Angular dependence of exchange bias and coercive field in CoFe/MnIr epitaxial bilayers",

abstract = "We have measured the hysteresis loop and torque curves at various applied magnetic field angle in CoFe/MnIr epitaxial bilayers on single crystal MgO (001), (111), and (011) samples. The (001) samples show double shifted magnetization curves, which are dominant as the MnIr thickness increases. It suggests that the unidirectional anisotropy and cubic anisotropy of CoFe (001) layer plays a key role in the formation of double shifted magnetization reversal. The angular variation of exchange bias (Hex) and coercive field (He) depend on the orientation of MgO substrates. The measured results are compared with calculated data, which are fitted using the crystalline anisotropy, unidirectional and uniaxial anisotropy induced by the field annealing. The calculated Hex and Hc as a function of measuring angles show similar trend as the measured ones. Theses energy contributions play an essential role in the angle dependent magnetization process in epitaxial CoFe/MnIr bilayers.",

keywords = "Crystalline anisotropy, Domain pattern, Epitaxial bilayer, Exchange bias and coercive field",

author = "Kim, {Dong Young} and Kim, {Cheol Gi} and Kim, {Chong Oh} and M. Shibata and M. Tsunoda and M. Takahashi",

note = "Funding Information: This work was supported by the Korea Science and Engineering Foundation through the Research Center for Advanced Magnetic Materials, Chungnam National University.",

year = "2005",

month = oct,

doi = "10.1109/TMAG.2005.854762",

language = "English",

volume = "41",

pages = "2712--2714",

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T1 - Angular dependence of exchange bias and coercive field in CoFe/MnIr epitaxial bilayers

AU - Kim, Dong Young

AU - Kim, Cheol Gi

AU - Kim, Chong Oh

AU - Shibata, M.

AU - Tsunoda, M.

AU - Takahashi, M.

N1 - Funding Information: This work was supported by the Korea Science and Engineering Foundation through the Research Center for Advanced Magnetic Materials, Chungnam National University.

PY - 2005/10

Y1 - 2005/10

N2 - We have measured the hysteresis loop and torque curves at various applied magnetic field angle in CoFe/MnIr epitaxial bilayers on single crystal MgO (001), (111), and (011) samples. The (001) samples show double shifted magnetization curves, which are dominant as the MnIr thickness increases. It suggests that the unidirectional anisotropy and cubic anisotropy of CoFe (001) layer plays a key role in the formation of double shifted magnetization reversal. The angular variation of exchange bias (Hex) and coercive field (He) depend on the orientation of MgO substrates. The measured results are compared with calculated data, which are fitted using the crystalline anisotropy, unidirectional and uniaxial anisotropy induced by the field annealing. The calculated Hex and Hc as a function of measuring angles show similar trend as the measured ones. Theses energy contributions play an essential role in the angle dependent magnetization process in epitaxial CoFe/MnIr bilayers.

AB - We have measured the hysteresis loop and torque curves at various applied magnetic field angle in CoFe/MnIr epitaxial bilayers on single crystal MgO (001), (111), and (011) samples. The (001) samples show double shifted magnetization curves, which are dominant as the MnIr thickness increases. It suggests that the unidirectional anisotropy and cubic anisotropy of CoFe (001) layer plays a key role in the formation of double shifted magnetization reversal. The angular variation of exchange bias (Hex) and coercive field (He) depend on the orientation of MgO substrates. The measured results are compared with calculated data, which are fitted using the crystalline anisotropy, unidirectional and uniaxial anisotropy induced by the field annealing. The calculated Hex and Hc as a function of measuring angles show similar trend as the measured ones. Theses energy contributions play an essential role in the angle dependent magnetization process in epitaxial CoFe/MnIr bilayers.

KW - Crystalline anisotropy

KW - Domain pattern

KW - Epitaxial bilayer

KW - Exchange bias and coercive field

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JO - IEEE Transactions on Magnetics

JF - IEEE Transactions on Magnetics

IS - 10

ER -

Angular dependence of exchange bias and coercive field in CoFe/MnIr epitaxial bilayers

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