Structure, magnetic and dielectric properties of BaTiO3-Co multi-layer nano-composite films

Yiwen Zhang, Nobukiyo Kobayashi, Shigehiro Ohnuma, Masateru Nose, Hiroshi Masumoto

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


The BTO-Co multi-layer nano-composite films have been deposited successfully, which consist of amorphous BTO layers and Co nano-particles layers. By controlling Co layer thickness from 6.3 to 0.3 nm, the resistivity of BTO-Co films increases from 100 to 106 μΩ m. And the magnetization of films changes from 0.73 to 0.01 T. Noteworthy, when the Co layer thickness is 2.5 nm, the films show superparamagnetic properties. HRTEM observation clearly shows that these films have the nanometer-sized metal Co particles of around 2 nm in diameters and a homogeneous dispersion. With lower Co layer thickness, the BTO-Co films exhibit high electrical resistivity. The dielectric constant tested at 1 kHz of these BTO-Co films increases from about 10-40, by controlling the Co layer thickness.

Original languageEnglish
Pages (from-to)925-928
Number of pages4
JournalJournal of Magnetism and Magnetic Materials
Publication statusPublished - 2016 Mar 1


  • BTO-Co nano-composite films
  • High insulation
  • Nanometer-sized particles
  • Superparamagnetic

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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