Temperature-induced self-pinning and nanolayering of AuSi eutectic droplets

A process for self-pinning of AuSi eutectic alloy droplets to a Si substrate is described that is induced by a controlled temperature annealing in ultrahigh vacuum. Phase separation is observed upon cooling of the droplets, which has led to the formation of amorphous Si-rich channels within the core and the formation of crystalline Si nanoshells on the outside.