  The magnetic properties of (Ca,Sr)RuO_3 and Sr_2YRuO_6 are studied within the
context of band structure based Stoner theory. LSDA calculations without
recourse to strong correlation effects yield the correct magnetic behavior and
order in all cases. Insulating character of Sr_2YRuO_6 is reproduced. The
different magnetic states of SrRuO_3 and CaRuO_3 are shown to be due to the
different structural distortions. CaRuO_3 is found to be on the verge of a
ferromagnetic instability. O p states hybridize strongly with Ru d states in
all three compounds, and O, through this hybridization plays an unusually large
role in the magnetic properties. Transport properties of CaRuO_3 and SrRuO_3
are analyzed using the calculated Fermiology. Unusually large magnon and
paramagnon couplings are found, which are consistent with reported measurements
of the low temperature specific heat and the resistivity coefficient. We also
demonstrate how the calculated band structures can be understood in terms of a
nearest neighbor tight binding model.
