Investigation of magnetic properties and microstructure of ultrathin Co films grown on Si(111)-7×7 surface

H. W. Chang, J. S. Tsay, Y. C. Hung, W. Y. Chan, W. B. Su, C. S. Chang, Y. D. Yao

Research output: Contribution to journalArticle

Abstract

Magnetic properties and growth mechanism of ultrathin Co films on Si(111)-7 × 7 surface have been studied by using both surface magneto-optic Kerr effect (SMOKE) and scanning tunneling microscopy (STM), respectively. STM results show that the growth mechanism of ultrathin Co films on Si(111)-7 × 7 surface at room temperature belongs to Stranski-Krastanov (SK) growth mode. Due to formation of CoSi 2 layer, no magnetic signal could be detected by SMOKE for 1-4 ML Co deposited on Si(111) surface. Because of rougher surface, both longitudinal and perpendicular magnetic anisotropy configuration appear for 4.2-10 ML Co/Si(111) films. When the Co thickness is increased to 10 ML, only longitudinal anisotropy configuration is found, resulting from the contribution to the volume anisotropy. Furthermore, in-plane coercivity increases with Co coverage because of enhancement of ferromagnetic coupling with Co thickness, out-of-plane coercivity increases with Co coverage due to the increment of demagnetized field, induced by the rougher Co surface and pinhole structures.

Original languageEnglish
Pages (from-to)2696-2699
Number of pages4
JournalJournal of Nanoscience and Nanotechnology
Volume11
Issue number3
DOIs
Publication statusPublished - 2011 Mar 1

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Keywords

  • Magnetic properties
  • Microstructure
  • Surface magneto-kerr effect

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics

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