Re-evaporation effect on the surface morphology of Gd x Y 1-x Ca 4 O(BO 3 ) 3 films grown by combinatorial laser molecular-beam epitaxy

T. W. Kim, N. Arai, H. Kubota, H. Koinuma, Y. Matsumoto, M. Yoshimura, H. Furuya, H. Nakao, Y. Mori, T. Sasaki

Research output: Contribution to journalConference articlepeer-review

Abstract

We have found unusual re-evaporation effect on the surface morphology of Gd x Y 1-x Ca 4 O(BO 3 ) 3 (Gd x Y 1-x COB) films grown by combinatorial laser molecular-beam epitaxy. The surface morphologies of the Gd x Y 1-x COB films grown on the atomically flat (0 1 0) GdCa 4 O(BO 3 ) 3 (GdCOB) substrates were strongly dependent on the deposition conditions such as substrate temperature and laser repetition rate. Decreasing the substrate temperature and/or increasing the laser repetition rate improved the surface morphology of the film since at such deposition conditions, re-evaporation which may make film surface rough could be effectively restrained. Gd x Y 1-x COB film grown at 500 °C and 4 Hz exhibited the ultra-smooth surface like that of the atomically smooth (0 1 0) GdCOB substrate. Under such conditions, intensity monitoring of reflection high-energy electron diffraction revealed the layer-by-layer growth of the film. Using this regulated growth behavior of the films we have successfully fabricated such nano-structured films as [GdCOB/YCa 4 O(BO 3 ) 3 ] superlattices.

Original languageEnglish
Pages (from-to)406-410
Number of pages5
JournalApplied Surface Science
Volume197-198
DOIs
Publication statusPublished - 2002 Jan 1
Externally publishedYes
EventCola 2001 - Tsukuba, Japan
Duration: 2001 Oct 12001 Oct 1

Keywords

  • Gd Y COB
  • Laser MBE
  • Re-evaporation
  • Surface

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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