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 |
|---|---|
| Journal | Journal of Magnetism and Magnetic Materials |
| Volume | 304 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2006 Sep 1 |
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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 journal › Article
}
TY - JOUR
T1 - Effect of oxygen exposure on the magnetic properties of ultrathin Co/Ge(1 1 1) films
AU - Tsay, Jyh-Shen
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
UR - http://www.scopus.com/inward/record.url?scp=33747076417&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33747076417&partnerID=8YFLogxK
U2 - 10.1016/j.jmmm.2006.01.182
DO - 10.1016/j.jmmm.2006.01.182
M3 - Article
AN - SCOPUS:33747076417
VL - 304
JO - Journal of Magnetism and Magnetic Materials
JF - Journal of Magnetism and Magnetic Materials
SN - 0304-8853
IS - 1
ER -