  We study static properties of disk-shaped binary dipolar Bose-Einstein
condensates of $^{168}$Er-$^{164}$Dy and $^{52}$Cr-$^{164}$Dy mixtures under
the action of inter- and intra-species contact and dipolar interactions and
demonstrate the effect of dipolar interaction using the mean-field approach.
Throughout this study we use realistic values of inter- and intra-species
dipolar interactions and the intra-species scattering lengths and consider the
inter-species scattering length as a parameter. The stability of the binary
mixture is illustrated through phase plots involving number of atoms of the
species. The binary system always becomes unstable as the number of atoms
increases beyond a certain limit. As the inter-species scattering length
increases corresponding to more repulsion, an overlapping mixed state of the
two species changes to a separated demixed configuration. During transition
from a mixed to a demixed configuration as the inter-species scattering length
is increased for parameters just below the stability line, the binary
condensate shows special structures in density in the form of
red-blood-cell-like biconcave and Saturn-ring-like shapes, which are direct
manifestations of dipolar interaction.
