Magnetic properties of ultrathin Co/Ge (111) film with oxygen surfactant

H. W. Chang, J. S. Tsay, Y. L. Chiou, K. T. Huang, W. Y. Chan, Y. D. Yao

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Magnetic properties of ultrathin CoGe (111) films with oxygen surfactant have been investigated using surface magneto-optic Kerr effect technique. As the oxygen exposure increases, their magnetic properties could be significantly modified. As the thickness of Co films increases to above 6 ML (monolayer), pure cobalt islands start to accumulate on the surface and the amount of oxygen on the surface layers increases with increasing oxygen exposure time. Series experiments of different sequences of oxygen exposure and Co deposition have been performed. From the results of slight chemical shift and depth profiling measurements, one can conclude that oxygen plays a role as a surfactant. The adsorbed oxygen influences the electronic density of states of Co and leads to the changes of the magnetic properties. The appearance of the OCoGe interface could modify the stress anisotropy, and as a result the coercivity of 30 ML CoGe (111) increases from 730 to 810 Oe with 500 L of oxygen exposure.

Original languageEnglish
Article number08J705
JournalJournal of Applied Physics
Volume99
Issue number8
DOIs
Publication statusPublished - 2006 May 29

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surfactants
magnetic properties
oxygen
magneto-optics
Kerr effects
coercivity
chemical equilibrium
surface layers
cobalt
anisotropy
electronics

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Chang, H. W., Tsay, J. S., Chiou, Y. L., Huang, K. T., Chan, W. Y., & Yao, Y. D. (2006). Magnetic properties of ultrathin Co/Ge (111) film with oxygen surfactant. Journal of Applied Physics, 99(8), [08J705]. https://doi.org/10.1063/1.2176315

Magnetic properties of ultrathin Co/Ge (111) film with oxygen surfactant. / Chang, H. W.; Tsay, J. S.; Chiou, Y. L.; Huang, K. T.; Chan, W. Y.; Yao, Y. D.

In: Journal of Applied Physics, Vol. 99, No. 8, 08J705, 29.05.2006.

Research output: Contribution to journalArticle

Chang, H. W. ; Tsay, J. S. ; Chiou, Y. L. ; Huang, K. T. ; Chan, W. Y. ; Yao, Y. D. / Magnetic properties of ultrathin Co/Ge (111) film with oxygen surfactant. In: Journal of Applied Physics. 2006 ; Vol. 99, No. 8.
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