Barrier height imaging of magnetic films: Use for studying the initial growth of Co films and the surface structure of FePt films

T. Kawagoe, E. Wakabayashi, Y. Murasawa, T. Sakata, M. Mizuguchi, K. Takanashi

Research output: Contribution to journalArticlepeer-review

Abstract

Barrier-height (BH) imaging using scanning tunneling microscopy (STM) was used to study the growth of Co films on Au(001) surfaces. We have observed BH of metastable bcc Co film (> 1 ML) for the first time, and that showed a large BH value (∼ 6 eV), whereas the observed BH of the Au(001) surface (∼ 3.5 eV) was consistent with the previous results. The origin of the large BH was qualitatively understood by considering that 3d electrons for tunneling are dominant for the Co(001) surface. We have observed numerous islands with different sizes and heights after 0.15 ML Co coverage and successfully obtained, from the BH imaging, an element-specific contrast, i.e. recognizing aggregated Au islands and Co islands, and information about inhomogenities of BH with proper consideration of the artifacts near the step edges. The height modification by the large BH difference is discussed. STM/BH studies of FePt films revealed two kinds of monolayer heights, the sum which was equal to the c axis lattice constant of L1 0 FePt. Two different dI/dz signal levels were observed on atomically flat terraces.

Original languageEnglish
Pages (from-to)226-232
Number of pages7
JournalSurface Science
Volume606
Issue number3-4
DOIs
Publication statusPublished - 2012 Feb

Keywords

  • Barrier height imaging
  • Cobalt
  • Growth
  • L1 -FePt alloy
  • Metal-metal magnetic heterostructures
  • Scanning tunneling microscopy

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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