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Current images of a annealed sample at positive tip bias . The tip biases are (a) , (b) , (c) and (d) .
Typical local plot at a leakage spot observed in a current image for a annealed sample. Curves (A) and (B) correspond to the first and second scan at the same spot, respectively.
Tip bias dependence of the leakage spot density for different imaging areas for (open and closed circles) and (open and closed squares) annealed samples.
Tip bias dependence of the leakage spot density and current density of and annealed samples for (a) positive and (b) negative tip biases.
The process where a conductive tip moves above a leakage path is shown schematically in one dimension. When the tip (contact area) is much larger than the leakage path, the size of the leakage path in the current image (b) will be close to the size of the contact area (a).
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