Characterization of the FPW with Atomic Force Microscopy

Both images below give an AFM scan of a 5 um x 5 um square section of the FPW membrane (Al). In the first photo, the transducer drive was switched on half way through the scan. The high frequency spatial fluctuations are believed to be random phase interactions between of the membrane and AFM tip. The amplitude, measured as the average height of each data point, overtstates the membrane amplitude.