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Growth Temperature Dependence of magnetoresistance in Co/Cu (111) Wedged Superlattices

Published online by Cambridge University Press:  03 September 2012

G. R. Harp ,
S. S. P. Parkin ,
R. F. C. Farrow ,
R. F. Marks ,
M. F. Toney ,
Q. H. Lam ,
T. A. Rabedeau ,
A. Cebollada  and
R. J. Savoy
G. R. Harp
Affiliation:
IBM Almadén Research Center, 650 Harry Rd., San Jose, CA 95120–6099
S. S. P. Parkin
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
M. F. Toney
Affiliation:
IBM Almadén Research Center, 650 Harry Rd., San Jose, CA 95120–6099
Q. H. Lam
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
A. Cebollada
Affiliation:
IBM Almadén Research Center, 650 Harry Rd., San Jose, CA 95120–6099
R. J. Savoy
Affiliation:
IBM Almadén Research Center, 650 Harry Rd., San Jose, CA 95120–6099
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Abstract

The Magnetoresistance of MBE deposited Co/Cu (111) superlattices as a function of Cu layer thickness is studied at various growth temperatures. Wedged superlattices are fabricated with uniform Co layers but with Cu layers whose thickness varies with position along the length of the substrate. Cu thickness is varied over the range 7–75Å. Only one Maximum M Magnetoresistance (MR) is observed for a Cu layer thickness ∼ 10Å for all growth temperatures studied (0°, 150°, 200°C). The optimal magnetoresistance values are achieved with 150°C growth temperature.

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References

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