Low-temperature synthesis of oriented CoPtCu–MgO and CoFePt–Ag–SiO₂ nanocomposite thin films by rf-magnetron sputtering

• SATO Kazuhisa

  Institute for Materials Research, Tohoku University

• KOSAKA Tamotsu

  Department of Materials Science, Tohoku University

• KONNO Toyohiko J.

  Institute for Materials Research, Tohoku University

Abstract

Nanocomposite thin films composed of oriented Co₅₀Pt₄₄Cu₆ nanoparticles embedded in a MgO matrix has been synthesized by rf-magnetron co-sputtering onto NaCl(001) substrates kept at 620 K. As the sputtering power increases, (001) orientation is improved and atomic ordering is also promoted. However, superlattice reflections are quite weak and the ordered region is limited in local area of the nanoparticles, indicating low degree of order. Electron diffraction and elemental mapping revealed that additive Cu is alloyed with CoPt. We have also fabricated (Co₂₆Fe₂₀)Pt₄₄–Ag₁₀–SiO₂ nanocomposite thin films at 675 K for comparison. Atomic ordering is promoted by Fe and Ag addition as well as higher substrate temperature; however, it was found that ternary element (Cu, Ag, Fe) addition into CoPt alloy is not so effective to promote atomic ordering. Origin of the slow ordering kinetics is discussed using thermodynamical parameters.

Journal

• Journal of the Ceramic Society of Japan

  Journal of the Ceramic Society of Japan 122 (1425), 317-321, 2014

  The Ceramic Society of Japan

Keywords

• CoPtCu–MgO
• CoFePt–Ag–SiO₂
• Nanoparticle
• Sputtering
• Kinetic ordering temperature
• Transmission electron microscopy

Details

• CRID: 1390001205287580288
• NII Article ID: 130004950946
• NII Book ID: AA12229489
• DOI: 10.2109/jcersj2.122.317
• ISSN: 13486535
• ISSN: 18820743
• HANDLE: 11094/89418
• Web Site: https://www.jstage.jst.go.jp/article/jcersj2/122/1425/122_JCSJ-P13227/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • IRDB
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed