Abstract
The amorphization and crystallization of the molybdenum (Mo) nanocontacts (NCs) via pulsed voltage application were observed in situ at the atomic resolution by transmission electron microscopy. Simultaneously, the variation in conductance of NCs during structural transformation was measured. The structural transformation could be controlled by the height of applied pulse waves. The amorphization was accelerated when NCs have longer constriction regions, which has not been found in NCs comprised of other metallic elements. The amorphized states of NCs were maintained during the observation at room temperature. The conductance ratio of amorphous Mo NCs to crystal Mo NCs was 0.62, which is lower than the ratio of liquid to solid Mo and is the lowest among those of other metallic NCs, leading to applications to advanced switching and memory functions.
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