  We have determined the temperature evolution of the spin and orbital moments
in the zero magnetization ferromagnet Sm$_{1-x}$Gd$_x$Al$_2$ (x = 0.024) by
combining polarized and unpolarized single crystal neutron diffraction data.
The sensitivity of the polarized neutron technique has allowed the moment
values to be determined with a precision of $\approx 0.1$~\mub. Our results
clearly demonstrate that, when magnetised by a field of 8T, the spin and
orbital moments in Sm$_{1-x}$Gd$_x$Al$_2$ are oppositely directed so that the
net magnetization is very small. Below 60 K the contributions from spin and
orbital motions are both about 2\mub\ with that due to orbital motion being
slightly larger than that due to spin. Between 60 and 65 K the contributions of
each to the magnetization fall rapidly and change sign at \Tcomp\ $\approx 67$K
above which the aligned moments recover but with the orbital magnetization
still slightly higher than the spin one. These results imply that above \Tcomp\
the small resultant magnetization of the \smion\ ion is oppositely directed to
the magnetizing field. It is suggested that this anomaly is due to polarization
of conduction electron spin associated with the doping Gd$^{3+}$ ions.
