We Can Figure This Out.org
Virtual Lab: Scanning Tunneling Microscope (STM)
 University of Virginia
             
 
© 2003-Present, John C. Bean
 
This is called the X, or X-axis drive of the STM probe.

Note that as this piezoelectric crystal expands, it forces the previous Z-drive arm (not now shown) to bend side to side. This is facilitated by making the arms out of a flexible circuit board material.
 
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