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

doi:10.1016/j.jmmm.2006.01.182

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

Department of Physics

Research output: Contribution to journal › Article › peer-review

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 language	English
Pages (from-to)	e68-e70
Journal	Journal of Magnetism and Magnetic Materials
Volume	304
Issue number	1
DOIs	https://doi.org/10.1016/j.jmmm.2006.01.182
Publication status	Published - 2006 Sep 1

Keywords

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

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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

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.",

keywords = "Cobalt, Germanium, Oxygen exposure, Surface magneto-optic Kerr effect, Ultrathin films",

author = "Tsay, {J. S.} and Chang, {H. W.} and Chiou, {Y. L.} and Huang, {K. T.} and Chan, {W. Y.} and Yao, {Y. D.}",

year = "2006",

month = sep,

day = "1",

doi = "10.1016/j.jmmm.2006.01.182",

language = "English",

volume = "304",

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T1 - Effect of oxygen exposure on the magnetic properties of ultrathin Co/Ge(1 1 1) films

AU - Tsay, J. S.

AU - Chang, H. W.

AU - Chiou, Y. L.

AU - Huang, K. T.

AU - Chan, W. Y.

AU - Yao, Y. D.

PY - 2006/9/1

Y1 - 2006/9/1

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.

KW - Cobalt

KW - Germanium

KW - Oxygen exposure

KW - Surface magneto-optic Kerr effect

KW - Ultrathin films

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