  We report the observation and manipulation of heteronuclear spin dynamics in
a spin-1 mixture of ultracold $^{87}$Rb and $^{23}$Na atoms. The dynamics is
driven by the interspecies spin-dependent interaction and shows a pronounced
dependence on magnetic fields with influences from both linear and quadratic
Zeeman shifts. Similar to the well-studied homonuclear cases, the interspecies
spin dynamics can be controlled by tuning the quadratic Zeeman shift with
far-detuned microwave fields. In addition, we successfully realize spin
dynamics control with vector light shifts which act as a species-selective
effective magnetic field on $^{87}$Rb atoms. Both methods show negligible loss
of atoms thus will be powerful techniques for investigating spin dynamics with
fast temporal and high spatial resolutions.
