  Exotic spin-dependent interactions may be generated by exchanging
hypothetical bosons that have been proposed to solve some mysteries in physics
by theories beyond the standard model of particle physics. The search for such
interactions can be conducted by tabletop scale experiments using high
precision measurement techniques. Here we report an experiment to explore the
parity-odd interaction between moving polarized electrons and unpolarized
nucleons using a magnetic force microscope. The polarized electrons are
provided by the magnetic tip at the end of a silicon cantilever, and their
polarizations are approximately magnetized in the plane of the magnetic coating
on the tip. A periodic structure with alternative gold and silicon dioxide
stripes provides unpolarized nucleons with periodic number density modulation.
The exotic forces are expected to change the oscillation amplitude of the
cantilever which is measured by a fiber laser interferometer. Data has been
taken by scanning the tip over the nucleon source structure at constant
separation, and no exotic signal related to the density modulation has been
observed. Thus, the experiment sets a limit on the electron-nucleon coupling
constant, $g_A^eg_V^N\leq 9\times 10^{-15}$ for 15 $\mu$m $\le \lambda \le$ 180
$\mu$m, using a direct force measurement method.
