Development of Thermoelectric Bi-Based Cobaltites with an Easy Axis of Magnetization Parallel to the $C$-Axis for Magnetic Alignment
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概要
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We report the conversion of the easy axis of magnetization from the $a$-axis to the $c$-axis in thermoelectric misfit-layered Bismuth-based cobaltites for a magnetic grain-alignment process. The conversion was accomplished by the substitution of Ca for Sr in the block layer of [(Bi0.5Pb0.5)2Sr2O4]0.55CoO2. Moreover, magnetic anisotropy along the $c$-axis was enhanced by partial substitution of Pr for Ca in [(Bi0.5Pb0.5)2Ca2O4]zCoO2. From the analysis of their crystal structures, we concluded that the doping of Pr and Ca played a role in distortion of the block layer, indirectly leading to changes in the local structure of the CoO2 layers and magnetic anisotropy. The $c$-axis grain-aligned bulk has been successfully fabricated by a magnetic grain-alignment method in 10 T, and a drastic reduction in the resistivity perpendicular to the applied field and the grain-oriented microstructure were observed.
- INSTITUTE OF PURE AND APPLIED PHYSICSの論文
- 2005-09-10
著者
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Kishio Kohji
Department Of Applied Chemistry Faculty Of Engineering University Of Tokyo
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Suzuki Tohru
National Inst. Of Material Sci.
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Uchikoshi Tetsuo
National Inst. Of Material Sci.
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Sakka Yoshio
National Inst. For Materials Sci.
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Shimoyama Jun-ichi
Department Of Applied Chemistry School Of Engineering University Of Tokyo
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Horii Shigeru
Department Of Applied Chemistry School Of Engineering University Of Tokyo
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Okamoto Taichi
Department Of Electrical Engineering Yamanashi University
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Horii Shigeru
Department of Applied Chemistry, School of Engineering, Univerity of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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Okamoto Taichi
Department of Superconductivity, School of Engineering, Univerity of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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Kumagai Toshiaki
Department of Superconductivity, School of Engineering, Univerity of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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Uchikoshi Tetsuo
National Institute of Materials and Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan
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