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Microstructural Dependence of the Perpendicular Magnetic Anisotropy in Co-Pt Alloys

Published online by Cambridge University Press:  03 September 2012

E. E. Marinero ,
R. F. C. Farrow ,
G. R. Harp ,
R. H. Geiss ,
J. A. Bain  and
B. Clemens
E. E. Marinero
Affiliation:
IBM Research Division, Almadén Research Center, 650 Harry Road, San Jose, CA 95120–6099
R. F. C. Farrow
Affiliation:
IBM Research Division, Almadén Research Center, 650 Harry Road, San Jose, CA 95120–6099
G. R. Harp
Affiliation:
IBM Research Division, Almadén Research Center, 650 Harry Road, San Jose, CA 95120–6099
R. H. Geiss
Affiliation:
IBM Research Division, Almadén Research Center, 650 Harry Road, San Jose, CA 95120–6099
J. A. Bain
Affiliation:
Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305.
B. Clemens
Affiliation:
Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305.
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Abstract

To establish the structural origins of the perpendicular magnetic anisotropy in Co-Pt alloys, a variety of magnetic and structural characterization techniques have been utilized. We have determined that the development of out-of-plane magnetization in these alloys, strongly depends on growth temperature and in contrast to CO/Pt Multilayers, the highest anisotropics and coercivities are observed in polycrystalline alloys with negligible preferred crystallographic orientation. Lattice strain Measurements, surface roughness determination and crystal growth studies indicate that contributions from magnetostrictive and magnetostatic contributions to the perpendicular anisotropy in these alloys are not significant. H RTEM and synchrotron-based x-ray diffraction experiments, on the other hand, confirm the existence of ordered CoPt3 at elevated temperatures. We suggest that the strong temperature dependence of the perpendicular anisotropy is correlated to the onset of spontaneous chemical ordering during the growth which results in anisotropie pair ordering. A tentative model explaining this strong temperature dependence is described.

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 , 677
Copyright
Copyright © Materials Research Society 1993

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References

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