  The spin-memory effect in the GaAs / InGaAs heterostructures with
$\delta$<Mn> layer in GaAs barrier have been investigated. The effect consists
in spin polarization of Mn atoms due to interaction with photogenerated
spin-polarized holes. The investigation of the effect was carried out by
analyzing the polarization of the probe photoluminescence pulse in the
pump-probe technique. It was shown that the circular polarization degree of
probe pulse generated photoluminescence is strongly affected by the interaction
of hole spins with spins of Mn atoms polarized by the pump pulse. The latter
leads to decrease of circular polarization degree as compared with single pulse
excitation ($\delta P$ effect). The amplitude of $\delta P$-effect is most
strongly affected by the concentration of resident electrons in the quantum
well which is believed to be due the specific compliance with selection rules
for optical transition with the participation of unpolarized resident
electrons. The rest of the sample's parameters including the spatial separation
between $\delta$<Mn> layer and InGaAs quantum well ($d_s$) have a minor effect
on the $\delta P$ value which leads to a paradoxical situation of decreasing
$\delta P$-effect with the decrease of $d_s$. The proposed experimental
technique consisting in creating the significant concentration of resident
electrons in the QW may serve as a reliable photoluminescence method
determining the strength of this effect as well as the Mn spin relaxation time
in a particular nanostructure.
