Gravity-assisted pulsed laser ablation for fabrication of compositional gradient thin film

Takashi Nishiyama, Takashi Kajiwara, Sachi Morinaga, Kunihito Nagayama

Research output: Contribution to journalArticle

Abstract

A compositional gradient thin film of Fe/Si was fabricated by gravity-assisted pulsed laser ablation under a gravity field of 5.3 × 104 m/s2. Systematic experiments were conducted by varying the values of several parameters including the gravity, distance between the target and the substrate, and laser fluence. The atomic fraction of Fe was measured by scanning electron microscopy/energy dispersive X-ray spectroscopy. We found that the atomic fraction of Fe increases along the gravity direction, i.e., it exhibits an apparent spatial gradient. We also found the optimal laser fluence at which a thin film having the largest possible spatial compositional gradient is obtained. It is shown that the surface energy density on the substrate surface is the key parameter to control the compositional distribution. The relatively high laser fluence as well as the very narrow space between the target and the substrate are found to be essential to sputter the film material. A plausible model is presented to explain the experimental data.

Original languageEnglish
Pages (from-to)92-97
Number of pages6
JournalThin Solid Films
Volume552
DOIs
Publication statusPublished - Feb 3 2014

Fingerprint

Laser ablation
Pulsed lasers
laser ablation
pulsed lasers
Gravitation
gravitation
Fabrication
Thin films
gradients
fluence
fabrication
thin films
Lasers
Substrates
lasers
Interfacial energy
surface energy
flux density
Scanning electron microscopy
scanning electron microscopy

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

Cite this

Gravity-assisted pulsed laser ablation for fabrication of compositional gradient thin film. / Nishiyama, Takashi; Kajiwara, Takashi; Morinaga, Sachi; Nagayama, Kunihito.

In: Thin Solid Films, Vol. 552, 03.02.2014, p. 92-97.

Research output: Contribution to journalArticle

Nishiyama, Takashi ; Kajiwara, Takashi ; Morinaga, Sachi ; Nagayama, Kunihito. / Gravity-assisted pulsed laser ablation for fabrication of compositional gradient thin film. In: Thin Solid Films. 2014 ; Vol. 552. pp. 92-97.
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