Abstract

In an equilibrium immiscible Au–Co system characterized by a positive heat of formation of +11 kJ mol−1, a non-equilibrium Au–Co phase of hcp structure was formed by 200 keV xenon ion mixing at 77 K in the Au50Co50 multilayered films. Based on the free energy calculation, the excess interfacial free energy stored in the Au–Co multilayered films could provide adequate thermodynamic driving force for alloying between Au and Co and forming the non-equilibrium Au–Co hcp phase. Besides, the average magnetic moment per Co atom in the newly formed hcp structure was reduced by 22% of its equilibrium value, within a measuring error of 8%.

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