Development of thermoelectric Bi-based cobaltites with an easy axis of magnetization parallel to the c-axis for magnetic alignment

Toshiaki Kumagai, Shigeru Horii*, Tetsuo Uchikoshi, Tohru S. Suzuki, Yoshio Sakka, Taichi Okamoto, Jun Ichi Shimoyama, Kohji Kishio

*この研究の対応する著者

研究成果: Article査読

13 被引用数 (Scopus)

抄録

We report the conversion of the easy axis of magnetization from the c-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 [(B0.5Pb 0.5)2Sr2O4]2Sr 2O4]0.55.CoO2 Moreover, magnetic anisotropy along the c-axis was enhanced by partial substitution of Pr for Ca in [(Bi0.5Pb0.5)2Ca2O 4]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. magnetic alignment, easy axis of magnetization, thermoelectric materials, [Bi2Sr2O4]0.55CoO 2, misfit crystal structure

本文言語English
ページ(範囲)L1263-L1266
ジャーナルJapanese Journal of Applied Physics, Part 2: Letters
44
37-41
DOI
出版ステータスPublished - 2005 9月 30
外部発表はい

ASJC Scopus subject areas

  • 工学(全般)
  • 物理学および天文学(その他)
  • 物理学および天文学(全般)

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