Abstract
An experimental technique has been recently developed to measure forces differentially between two samples with similar but not identical compositions. The implementation of this approach, with the important reduction in common background effects is reported. An Au-covered rotating sample composed of Au and Ni sectors interacts with either Au-or Ni- covered spheres. Emphasis is paid to the discussion of remnant systematic effects and their impact on the measurements. It is observed that a residual impulsive motion of the axis of rotation of the apparatus remain, contributing at the 0.1 fN level. Apparently random oscillations of the axis of rotation also increase the minimum detectable force by a factor near two. Finally, the remnant magnetic interaction between not completely demagnetized Ni is reduced beyond detection by using a spatial and temporal averaging of the contribution.
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