  The time dependent response of the magnetic and transport properties of
Fe-doped phase separated (PS) manganite La$_{0.5}$Ca$_{0.5}$MnO$_{3}$ is
reported. The nontrivial coexistence of ferromagnetic (FM) and non FM regions
induces a slow dynamics which leads to time relaxation and cooling rate
dependence within the PS regime. This dynamics influences drastically on
physical properties. On one hand, metallic like behavior, assumed to be a
fingerprint of percolation, can be also observed before the FM phase percolates
as a result of dynamical contributions. On the other one, two novel effects for
the manganites are reported, namely the rejuvenation of the resistivity after
ageing, and a persistent memory of low magnetic fields ($<$ 1 T), imprinted in
the amount of the FM phase. As a distinctive fact, this memory can be recovered
through transport measurements.

Strongly Correlated Electrons;Materials Science