Observation of stress relaxation via step formation in Co/Pt metallic superlattices

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We report the direct observation of stress relaxation in lattice-mismatched Co/Pt superlattices with increasing Co-layer thickness, via in situ and real-time measurements using a submonolayer-sensitive stress measurement apparatus. A large tensile stress in the Co layers found to be relaxed when the Co layer thickness was larger than 2 monolayers, corresponding to the critical thickness expected for coherent-to-incoherent transition in this system. Cross-sectional high-resolution transmission electron microscopy studies revealed that stress relaxation was realized by formation of steps, rather than misfit dislocations, near the interfaces.
Publisher
American Institute of Physics
Issue Date
2000-02
Citation

APPLIED PHYSICS LETTERS, Vol.76, No.7, pp.831-833

ISSN
0003-6951
URI
http://hdl.handle.net/10203/18036
Appears in Collection
PH-Journal Papers(저널논문)
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