論文

2019年4月1日

Perpendicular magnetic anisotropy and tunneling conductivity of epitaxial cobalt-ferrite (0 0 1) films grown on nonmagnetic metal films

Journal of Magnetism and Magnetic Materials
  • Katsuyoshi Naruse
  • ,
  • Masaaki Tanaka
  • ,
  • Kosuke Nomura
  • ,
  • Takuya Taniguchi
  • ,
  • Takuya Taniguchi
  • ,
  • Syuta Honda
  • ,
  • Syuta Honda
  • ,
  • Teruo Ono
  • ,
  • Teruo Ono
  • ,
  • Ko Mibu

475
開始ページ
721
終了ページ
726
DOI
10.1016/j.jmmm.2018.12.025

© 2018 Elsevier B.V. We successfully fabricated perpendicularly magnetized cobalt-ferrite CoxFe3-xO4+δ (0 0 1) films on nonmagnetic metal TiN (0 0 1) films. We found that the in-plane lattice constant of the CoxFe3-xO4+δ (0 0 1) films was larger than the out-of-plane lattice constant. This lattice strain induced perpendicular magnetic anisotropy, and square hysteresis curves were observed in out-of-plane magnetic fields for the CoxFe3-xO4+δ (x = 0.4 ∼ 0.6) films. With the decrease of the Co composition from x = 1 to x = 0, the CoxFe3-xO4+δ films approached not to conductive Fe3O4 but to insulating γ-Fe2O3 accompanying cation vacancies in the cubic spinel structure. The good tunneling conductivity character was observed for the CoxFe3-xO4+δ tunnel junctions. The results open up a possibility that insulating CoxFe3-xO4+δ films can be applied to elements of perpendicularly magnetized spintronics devices.

リンク情報
DOI
https://doi.org/10.1016/j.jmmm.2018.12.025
URL
https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85058377669&origin=inward

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