  With FORS1 at the VLT we have tried for the first time to measure the
magnetic field variation over the pulsation cycle in six roAp stars to begin
the study of how the magnetic field and pulsation interact. For the star
HD101065, which has one of the highest photometric pulsation amplitudes of any
roAp star, we found a signal at the known photometric pulsation frequency at
the 3 sigma level in one data set; however this could not be confirmed by later
observations. A preliminary simple calculation of the expected magnetic
variations over the pulsation cycle suggests that they are of the same order as
our current noise levels, leading us to expect that further observations with
increased S/N have a good chance of achieving an unequivocal detection.
