Linear correlation between uncompensated antiferromagnetic spins and exchange bias in Mn-Ir/Co100-xFex bilayers

Masakiyo Tsunoda; Hirokazu Takahashi; Tetsuya Nakamura; Chiharu Mitsumata; Shinji Isogami; Migaku Takahashi

doi:10.1063/1.3479500

Linear correlation between uncompensated antiferromagnetic spins and exchange bias in Mn-Ir/Co_100-xFe_x bilayers

Masakiyo Tsunoda, Hirokazu Takahashi, Tetsuya Nakamura, Chiharu Mitsumata, Shinji Isogami, Migaku Takahashi

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

29 Citations (Scopus)

Abstract

A correlation between uncompensated (UC) antiferromagnetic (AF) spins and exchange bias (EB) strength was investigated for Mn₇₄Ir ₂₆/Co_100-xFe_x bilayers. The EB strength had a maximum at x=25 at. %, and the x-ray magnetic circular dichroism of Mn, representing the UC-AF spins, changed systematically in sign and magnitude with respect to x. A linear correlation was found between the EB strength and the root mean square magnitude of the UC-Mn spins. The hidden parameter connecting these two quantities might be exchange coupling energy at the heterointerface, which varies as a function of the ferromagnetic layer composition.

Original language	English
Article number	072501
Journal	Applied Physics Letters
Volume	97
Issue number	7
DOIs	https://doi.org/10.1063/1.3479500
Publication status	Published - 2010 Aug 16

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abstract = "A correlation between uncompensated (UC) antiferromagnetic (AF) spins and exchange bias (EB) strength was investigated for Mn74Ir 26/Co100-xFex bilayers. The EB strength had a maximum at x=25 at. %, and the x-ray magnetic circular dichroism of Mn, representing the UC-AF spins, changed systematically in sign and magnitude with respect to x. A linear correlation was found between the EB strength and the root mean square magnitude of the UC-Mn spins. The hidden parameter connecting these two quantities might be exchange coupling energy at the heterointerface, which varies as a function of the ferromagnetic layer composition.",

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AU - Tsunoda, Masakiyo

AU - Takahashi, Hirokazu

AU - Nakamura, Tetsuya

AU - Mitsumata, Chiharu

AU - Isogami, Shinji

AU - Takahashi, Migaku

PY - 2010/8/16

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AB - A correlation between uncompensated (UC) antiferromagnetic (AF) spins and exchange bias (EB) strength was investigated for Mn74Ir 26/Co100-xFex bilayers. The EB strength had a maximum at x=25 at. %, and the x-ray magnetic circular dichroism of Mn, representing the UC-AF spins, changed systematically in sign and magnitude with respect to x. A linear correlation was found between the EB strength and the root mean square magnitude of the UC-Mn spins. The hidden parameter connecting these two quantities might be exchange coupling energy at the heterointerface, which varies as a function of the ferromagnetic layer composition.

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Linear correlation between uncompensated antiferromagnetic spins and exchange bias in Mn-Ir/Co_100-xFe_x bilayers

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