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Interdiffusion, Crystallinity and Exchange Bias in MnxPt1-x/Co Bilayers

Published online by Cambridge University Press:  10 February 2011

Erie H. Morales ,
Yikuan Wang  and
D. Lederman
Erie H. Morales
Affiliation:
Department of Physics, West Virginia University, Morgantown WV 26506–6315
Yikuan Wang
Affiliation:
Department of Physics, West Virginia University, Morgantown WV 26506–6315
D. Lederman
Affiliation:
Department of Physics, West Virginia University, Morgantown WV 26506–6315
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Abstract

The structure of the antiferromagnet (AF) in the Ta/ MnxPt1-x/Co /Ta system must have the face-centered tetragonal CuAu structure in order to obtain a measurable exchange bias (H E ). The formation of this structure has an onset temperature of approximately 240 °C. Increasing the annealing temperature increases the amount of CuAu ordering, which increases H E , and also increases the MnPt/Co interdiffusion, which decreases H E . These two competing processes result in an optimum annealing temperature that maximizes H E .

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References

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