  We report neutron depolarization measurements of the suppression of
long-range ferromagnetism and the emergence of magnetic irreversibilities and
spin freezing in CePd$_{1-x}$Rh$_x$ around $x^*\approx0.6$. Tracking the
temperature versus field history of the neutron depolarization, we find clear
signatures of long-range Ising ferromagnetism below a Curie temperature $T_{\rm
C}$ for $x=0.4$ and a spin freezing of tiny ferromagnetic clusters below a
freezing temperature $T_{\rm F1}$ for $x>x^*$. Under
zero-field-cooling/field-heating and for $x>x^*$ a reentrant temperature
dependence of the neutron depolarization between $T_{\rm F2}<T_{\rm F1}$ and
$T_{\rm F1}$ is microscopically consistent with a thermally activated growth of
the cluster size. The evolution of the depolarization as well as the reentrant
temperature dependence as a function of Rh content are consistent with the
formation of a Kondo-cluster glass below $T_{\rm F1}$ adjacent to a
ferromagnetic quantum phase transition at $x^*$.

Strongly Correlated Electrons;Materials Science