Large perpendicular exchange bias and high blocking temperature in Al-doped Cr2O3/Co thin film systems

Tomohiro Nozaki; Yohei Shiokawa; Yukie Kitaoka; Yohei Kota; Hiroshi Imamura; Muftah Al-Mahdawi; Satya Prakash Pati; Shujun Ye; Syougo Yonemura; Tatsuo Shibata; Masashi Sahashi

doi:10.7567/APEX.10.073003

Large perpendicular exchange bias and high blocking temperature in Al-doped Cr₂O₃/Co thin film systems

Tomohiro Nozaki, Yohei Shiokawa, Yukie Kitaoka, Yohei Kota, Hiroshi Imamura, Muftah Al-Mahdawi, Satya Prakash Pati, Shujun Ye, Syougo Yonemura, Tatsuo Shibata, Masashi Sahashi

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10 Citations (Scopus)

Abstract

We investigated the effect of Al doping on the perpendicular exchange bias in Cr₂O₃/Co thin film systems. By Al doping, a large unidirectional anisotropy energy (J_K ∼ 0.74 erg/cm²) and a high blocking temperature (T_B) were obtained simultaneously. The variations in J_K and T_B induced by Al doping were discussed on the basis of Mauri's model and explained from an increase in magnetic anisotropy and a decrease in the exchange stiffness constant of Cr₂O₃. Our first-principles calculations suggest a factor to improve the magnetic anisotropy of Cr₂O₃ markedly, which is different from the previously established lattice strain effect.

Original language	English
Article number	073003
Journal	Applied Physics Express
Volume	10
Issue number	7
DOIs	https://doi.org/10.7567/APEX.10.073003
Publication status	Published - 2017 Jul

ASJC Scopus subject areas

Engineering(all)
Physics and Astronomy(all)

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title = "Large perpendicular exchange bias and high blocking temperature in Al-doped Cr2O3/Co thin film systems",

abstract = "We investigated the effect of Al doping on the perpendicular exchange bias in Cr2O3/Co thin film systems. By Al doping, a large unidirectional anisotropy energy (JK ∼ 0.74 erg/cm2) and a high blocking temperature (TB) were obtained simultaneously. The variations in JK and TB induced by Al doping were discussed on the basis of Mauri's model and explained from an increase in magnetic anisotropy and a decrease in the exchange stiffness constant of Cr2O3. Our first-principles calculations suggest a factor to improve the magnetic anisotropy of Cr2O3 markedly, which is different from the previously established lattice strain effect.",

author = "Tomohiro Nozaki and Yohei Shiokawa and Yukie Kitaoka and Yohei Kota and Hiroshi Imamura and Muftah Al-Mahdawi and Pati, {Satya Prakash} and Shujun Ye and Syougo Yonemura and Tatsuo Shibata and Masashi Sahashi",

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T1 - Large perpendicular exchange bias and high blocking temperature in Al-doped Cr2O3/Co thin film systems

AU - Nozaki, Tomohiro

AU - Shiokawa, Yohei

AU - Kitaoka, Yukie

AU - Kota, Yohei

AU - Imamura, Hiroshi

AU - Al-Mahdawi, Muftah

AU - Pati, Satya Prakash

AU - Ye, Shujun

AU - Yonemura, Syougo

AU - Shibata, Tatsuo

AU - Sahashi, Masashi

PY - 2017/7

Y1 - 2017/7

N2 - We investigated the effect of Al doping on the perpendicular exchange bias in Cr2O3/Co thin film systems. By Al doping, a large unidirectional anisotropy energy (JK ∼ 0.74 erg/cm2) and a high blocking temperature (TB) were obtained simultaneously. The variations in JK and TB induced by Al doping were discussed on the basis of Mauri's model and explained from an increase in magnetic anisotropy and a decrease in the exchange stiffness constant of Cr2O3. Our first-principles calculations suggest a factor to improve the magnetic anisotropy of Cr2O3 markedly, which is different from the previously established lattice strain effect.

AB - We investigated the effect of Al doping on the perpendicular exchange bias in Cr2O3/Co thin film systems. By Al doping, a large unidirectional anisotropy energy (JK ∼ 0.74 erg/cm2) and a high blocking temperature (TB) were obtained simultaneously. The variations in JK and TB induced by Al doping were discussed on the basis of Mauri's model and explained from an increase in magnetic anisotropy and a decrease in the exchange stiffness constant of Cr2O3. Our first-principles calculations suggest a factor to improve the magnetic anisotropy of Cr2O3 markedly, which is different from the previously established lattice strain effect.

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Large perpendicular exchange bias and high blocking temperature in Al-doped Cr₂O₃/Co thin film systems

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