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Microstructures in CoPtC magnetic thin films studied by superpositioning of micro-electron diffraction

Tomita1, Sugiyama, Sato

  • 1NTT Science and Core Technology Laboratory Group, Atsugi, Kanagawa, Japan. tomita@ilab.ntt.co.jp

Journal of Electron Microscopy
|May 3, 2000
PubMed
Summary

Transmission electron microscopy revealed that 10 nm cobalt-platinum-carbon (CoPtC) particles were elongated. Micro-electron diffraction analysis showed no preferred crystal orientation in these ultrafine particles.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid State Physics

Background:

  • Characterizing ultrafine particles in thin films presents challenges for traditional diffraction methods.
  • Understanding the morphology and crystal orientation of CoPtC nanoparticles is crucial for their applications.

Purpose of the Study:

  • To investigate the morphology of 10 nm CoPt particles within CoPtC thin films.
  • To determine the crystal orientation of these ultrafine CoPt particles.
  • To evaluate a novel micro-electron diffraction superpositioning technique.

Main Methods:

  • Cross-sectional transmission electron microscopy (TEM) for morphological analysis.
  • Superposition of 40 micro-electron diffraction patterns for orientation determination.
  • Application of the technique to CoPtC thin films.

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Main Results:

  • CoPt nanoparticles were observed to be typically elongated along the substrate normal.
  • Analysis indicated no preferred crystal orientation of the CoPt particles.
  • The micro-electron diffraction superpositioning technique proved effective for small-crystal thin films.

Conclusions:

  • The study elucidates the anisotropic nature of ultrafine CoPt particles in thin films.
  • The developed diffraction technique offers a viable alternative for analyzing materials with limited crystal size.
  • Findings contribute to the understanding of nanoparticle behavior in thin film structures.