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Article Dans Une Revue Applied Surface Science Année : 2015

Interface observation of heat-treated Co/Mo2C multilayers

Résumé

We study the interface evolution of a series of periodic Co/Mo2C multilayers as a function of the annealing temperature up to 600°C. Different complementary techniques are implemented to get information on the phenomenon taking place at the interfaces of the stack. The periodical structure of Co/Mo2C multilayer is proven by Time-of-flight secondary ion mass spectrometry (ToF-SIMS) depth profiles which demonstrate the formation of an oxide layer at both air/stack and stack/substrate interfaces. From Nuclear magnetic resonance (NMR) spectra, we observed the intermixing phenomenon of Co and C atoms for the as-deposited sample, and then at annealing temperature above 300°C Co and C atoms separate from their mixed regions. Comparison of NMR results between Co/Mo 2 C and Co/C references confirms this phenomenon. This is in agreement with x-ray emission spectroscopy (XES) measurements. Furthermore the calculation of the Co-C, Co-Mo and Mo-C mixing enthalpy using Miedema's model gives a proof of the demixing of Co and C atoms present within the stacks above 300°C. From the transmission electron microscopy (TEM) analysis, we found the presence of some crystallites within the as-deposited sample as well as the mainly amorphous nature of all layers. This is confirmed using x-ray diffraction (XRD) patterns which also demonstrate the growth of crystallites induced upon annealing.
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Dates et versions

hal-01110582 , version 1 (28-01-2015)

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Yanyan Yuan, Karine Le Guen, Jean-Michel André, Christian Mény, Corinne Ulhaq, et al.. Interface observation of heat-treated Co/Mo2C multilayers. Applied Surface Science, 2015, 331, pp.8-16. ⟨10.1016/j.apsusc.2014.12.055⟩. ⟨hal-01110582⟩
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