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Magneto Optical Kerr Spectroscopy as a Probe of Chemical Ordering in CoPt

Published online by Cambridge University Press:  03 September 2012

G. R. Harp ,
D. Weiler ,
T. A. Rabedeau ,
R. F. C. Farrow  and
R. F. Marks
G. R. Harp
Affiliation:
IBM Almadén Research Center, 650 Harry Rd., San Jose, CA 95120–6099
D. Weiler
Affiliation:
IBM Almadén Research Center, 650 Harry Rd., San Jose, CA 95120–6099
T. A. Rabedeau
Affiliation:
IBM Almadén Research Center, 650 Harry Rd., San Jose, CA 95120–6099
R. F. C. Farrow
Affiliation:
IBM Almadén Research Center, 650 Harry Rd., San Jose, CA 95120–6099
R. F. Marks
Affiliation:
IBM Almadén Research Center, 650 Harry Rd., San Jose, CA 95120–6099
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Abstract

We demonstrate that the photon energy dependence of the polar Kerr effect can be used as a sensitive probe of chemical ordering effects in binary intermetallic alloys. We demonstrate this effect in the Co50Pt50 alloy, which is known to have a Ll0 phase (critical temperature ∼825°C). Kerr spectra of the ordered and disordered phases of the Co50Pt50 alloy composition differ drastically from each other and the ordered phase shows an unprecedented, new peak at 2.2eV photon energy. The intensity of this new peak correlates with the degree of chemical ordering and the magnetic anisotropy in these films.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 313: Symposium Q1 – Magnetic Ultrathin Films, Multilayers and Surfaces/Magnetic Interfaces-Physics and Characterizations , 1993 , 493
Copyright
Copyright © Materials Research Society 1993

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References

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