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

Jyh-Shen Tsay, H. W. Chang, Y. L. Chiou, K. T. Huang, W. Y. Chan, Y. D. Yao

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish
JournalJournal of Magnetism and Magnetic Materials
Volume304
Issue number1
DOIs
Publication statusPublished - 2006 Sep 1

Fingerprint

Magnetic properties
Oxygen
magnetic properties
oxygen
Coercive force
coercivity
Magnetooptical effects
Electronic density of states
Remanence
Ultrathin films
magneto-optics
Auger electron spectroscopy
remanence
Kerr effects
Auger spectroscopy
electron spectroscopy
surface layers
Anisotropy
anisotropy
Chemical analysis

Keywords

  • Cobalt
  • Germanium
  • Oxygen exposure
  • Surface magneto-optic Kerr effect
  • Ultrathin films

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Effect of oxygen exposure on the magnetic properties of ultrathin Co/Ge(1 1 1) films. / Tsay, Jyh-Shen; Chang, H. W.; Chiou, Y. L.; Huang, K. T.; Chan, W. Y.; Yao, Y. D.

In: Journal of Magnetism and Magnetic Materials, Vol. 304, No. 1, 01.09.2006.

Research output: Contribution to journalArticle

Tsay, Jyh-Shen ; Chang, H. W. ; Chiou, Y. L. ; Huang, K. T. ; Chan, W. Y. ; Yao, Y. D. / Effect of oxygen exposure on the magnetic properties of ultrathin Co/Ge(1 1 1) films. In: Journal of Magnetism and Magnetic Materials. 2006 ; Vol. 304, No. 1.
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AU - Tsay, Jyh-Shen

AU - Chang, H. W.

AU - Chiou, Y. L.

AU - Huang, K. T.

AU - Chan, W. Y.

AU - Yao, Y. D.

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N2 - 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.

AB - 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.

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KW - Surface magneto-optic Kerr effect

KW - Ultrathin films

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