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We investigate the role of local heating and forces on ions in the stabilityof current-carrying aluminum wires. We find that heating increases with wirelength due to a red shift of the frequency spectrum. Nevertheless, the localtemperature of the wire is relatively low for a wide range of biases providedgood thermal contact exists between the wire and the bulk electrodes. On thecontrary, current-induced forces increase substantially as a function of biasand reach bond-breaking values at about 1 V. These results suggest that localheating promotes low-bias instabilities if dissipation into the bulk electrodesis not efficient, while current-induced forces are mainly responsible for thewire break-up at large biases. We compare these results to experimentalobservations.Comment: 4 pages, 4 figure

Role of heating and current-induced forces in the stability of atomic wires