Effect of oxygen exposure on the magnetic properties of ultrathin Co/Ge(1 1 1) films

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

研究成果: 雜誌貢獻文章

摘要

Influences of oxygen exposure on the magnetic properties of Co/Ge(1 1 1) ultrathin films have been investigated by surface magneto-optic Kerr effect technique. As the oxygen exposure increases on Co/Ge(1 1 1) films, their magnetic properties could be modified. As an example for 15 ML Co/Ge(1 1 1) films, the coercivity increases from 730 to 920 Oe and the remanence Kerr intensity is reduced for 500 Langmuir (L) of oxygen exposure. Corresponding compositions analyzed by Auger electron spectroscopy measurement shows that the amount of oxygen on the surface layers increases with increasing the oxygen exposure time. Oxygen distributes on the topmost layers of the film. The adsorbed oxygen influences the electronic density of states of Co and results in the changes of the magnetic properties. Besides, the appearance of O/Co/Ge interface could modify the stress anisotropy, and as a result the coercivity of ultrathin Co/Ge(1 1 1) film is enhanced.

原文英語
頁(從 - 到)e68-e70
期刊Journal of Magnetism and Magnetic Materials
304
發行號1
DOIs
出版狀態已發佈 - 2006 九月 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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