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

H. W. Chang, Jyh-Shen 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

Fingerprint

Anisotropy
Scanning Tunnelling Microscopy
Magnetic properties
magnetic properties
microstructure
Microstructure
Growth
Magnetooptical effects
magneto-optics
Scanning tunneling microscopy
Kerr effects
Coercive force
anisotropy
coercivity
scanning tunneling microscopy
Temperature
magnetic signals
Magnetic anisotropy
pinholes
configurations

Keywords

  • Magnetic properties
  • Microstructure
  • Surface magneto-kerr effect

ASJC Scopus subject areas

  • Medicine(all)

Cite this

Investigation of magnetic properties and microstructure of ultrathin Co films grown on Si(111)-7×7 surface. / Chang, H. W.; Tsay, Jyh-Shen; Hung, Y. C.; Chan, W. Y.; Su, W. B.; Chang, C. S.; Yao, Y. D.

In: Journal of Nanoscience and Nanotechnology, Vol. 11, No. 3, 01.03.2011, p. 2696-2699.

Research output: Contribution to journalArticle

Chang, H. W. ; Tsay, Jyh-Shen ; Hung, Y. C. ; Chan, W. Y. ; Su, W. B. ; Chang, C. S. ; Yao, Y. D. / Investigation of magnetic properties and microstructure of ultrathin Co films grown on Si(111)-7×7 surface. In: Journal of Nanoscience and Nanotechnology. 2011 ; Vol. 11, No. 3. pp. 2696-2699.
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