  Detailed information about the magnetic geometry, atmospheric abundances and
radial velocity variations has been obtained for the magnetic standard star HD
94660 based on high-dispersion spectroscopic and spectropolarimetric
observations from the UVES, HARPSpol and ESPaDOnS instruments.
  We perform a detailed chemical abundance analysis using the spectrum
synthesis code zeeman for a total of 17 elements. Using both line-of-sight and
surface magnetic field measurements, we derive a simple magnetic field model
that consists of dipole, quadrupole and octupole components.
  The observed magnetic field variations of HD 94660 are complex and suggest an
inhomogeneous distribution of chemical elements over the stellar surface. This
inhomogeneity is not reflected in the abundance analysis, from which all
available spectra are modelled, but only a mean abundance is reported for each
element. The derived abundances are mostly non-solar, with striking
overabundances of Fe-peak and rare-earth elements. Of note are the clear
signatures of vertical chemical stratification throughout the stellar
atmosphere, most notably for the Fe-peak elements. We also report on the
detection of radial velocity variations with a total range of 35 km/s in the
spectra of HD 94660. A preliminary analysis shows the most likely period of
these variations to be of order 840 d and, based on the derived orbital
parameters of this star, suggests the first detection of a massive compact
companion for a main sequence magnetic star.
  HD 94660 exhibits interestingly complex magnetic field variations and
remarkable radial velocity variations. Long term monitoring is necessary to
provide further constraints on the nature of these radial velocity variations.
Detection of a companion will help establish the role of binarity in the origin
of magnetism in stars with radiative envelopes.
