Role of stress in thin film alloy thermodynamics: competition between alloying and dislocation formation |
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Authors: | Thayer G E Ozolins V Schmid A K Bartelt N C Asta M Hoyt J J Chiang S Hwang R Q |
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Institution: | Sandia National Laboratories, Livermore, California 94551, USA. |
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Abstract: | Using scanning tunneling microscopy (STM) and first-principles local-spin-density-approximation calculations to study submonolayer films of Co (1-c)Ag (c)/Ru(0001) alloys, we have discovered a novel phase-separation mechanism. When the Ag concentration c exceeds 0.4, the surface phase separates between a dislocated, pure Ag phase and a pseudomorphically strained Co(0.6)Ag (0.4) surface alloy. We attribute the phase separation to the competition between two stress relief mechanisms: surface alloying and dislocation formation. The agreement between STM measurements and our calculated phase diagram supports this interpretation. |
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