Scanning tunneling microscopy (STM) of Au(001) single crystals has been used to characterize dislocation configurations resulting mainly from nanoindentation of the surface by contact with the STM tip. The Burgers vectors and directions of the different extended dislocations are identified by comparing STM pictures with simulated images of the corresponding atomic configurations. We describe a configuration consisting of an unfaulted dislocation loop split into two pairs of Shockley partials, linked by a stair-rod segment that holds the two stacking-fault ribbons. The separation between Shockley partials in the extended dislocations is found to be larger than in the bulk.
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Figuera et al. (1998) studied this question.
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