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Image of current in thin-film wire in Physics Today

Posted by Leisure7 (A) on June 29, 2003 at 15:41:37

Anyone with access to Physics Today or Applied Physics Letters can see a photograph of the current distribution in a three-micron-wide aluminum conductor fabricated with what appear to be standard integrated circuit metallization techniques. The June issue of Physics Today has the photograph on page 9, under the Physics Update section, and references the original article in Applied Physics Letters 82, 3272, 2003.

The researchers, B.D. Schrag and G. Xiao of Brown University, made a scanning magnetic microscope out of a magnetoresistance sensor (probably a thin-film read head out of a disk drive).

The abstract in Physics Today does not give details needed to interpret the color scale employed, so the voids and hotspots shown may be of minor significance. The ugliness of the distribution is certainly enough to raise questions about the audibility of sample-to-sample variation in sound from analog integrated circuits.

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