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Contact: Paul Preuss
DOE/Lawrence Berkeley National Laboratory

Nanoscale Crop Circles

Caption: When a thin layer of gold anneals on top of a silicon wafer coated with native silicon dioxide, randomly distributed pools of eutectic alloy quickly form -- and then go through a rapid series of strange changes, leaving behind bare silicon-dioxide circles surrounded by debris. Each denuded circle reveals a perfect square at its center. The area shown is about 107 by 155 micrometers (millionths of a meter).

Credit: Lawrence Berkeley National Laboratory

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