  A sample of 19 solar-type stars, probing masses between 0.6 and 1.4 solar
mass and rotation periods between 3.4 and 43 days, was regularly observed using
the NARVAL spectropolarimeter at Telescope Bernard Lyot (Pic du Midi, France)
between 2007 and 2011. The Zeeman-Doppler Imaging technique is employed to
reconstruct the large-scale photospheric magnetic field structure of the
targets and investigate its long-term temporal evolution. We present here the
first results of this project with the observation of short magnetic cycles in
several stars, showing up a succession of polarity reversals over the timespan
of our monitoring. Preliminary trends suggest that short cycles are more
frequent for stellar periods below a dozen days and for stellar masses above
about one solar mass. The cycles lengths unveiled by the direct tracking of
polarity switches are significantly shorter than those derived from previous
studies based on chromospheric activity monitoring, suggesting the coexistence
of several magnetic timescales in a same star.
