Programmable devices and fabrication methods thereof are presented. The programmable devices include, for instance, a first electrode and a second electrode electrically connected by a link portion. The link portion includes one material of a metal material or a semiconductor material and the first and second electrodes includes the other material of the metal material or the semiconductor material. For example, the link portion facilitates programming the programmable device by applying a programming current between the first electrode and the second electrode to facilitate migration of the one material of the link portion towards at least one of the first or second electrodes. In one embodiment, the programming current is configured to heat the link portion to facilitate the migration of the one material of the link portion towards the at least one of the first or second electrodes.