In-situ stress measurements of sputtered multilayers
2010
The mechanical stress induced during the growth of thin films and multilayers is a critical parameter for the fabrication
of reflective x-ray optical elements. Strong stress can cause deformation of the optical surface, de-lamination of the
respective coating, or even breaking of the underlying substrate.
In order to characterize stress in a growing film or multilayer in a nearly in-situ mode, a dedicated monitor was installed
on the ESRF multilayer deposition system. It is based on an autocollimator that measures the curvature change of a
sample after subsequent coating steps while keeping it in the vacuum environment. Based on the theory of elasticity, the
corresponding stress levels in the coating can be derived.
Both the commissioning of the instrument and some initial results on single Ru and B 4 C films and Ru/B 4 C multilayers
will be presented. A comparison with ex-situ investigations will complement this work.
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