  In this work we propose an alternative model to explain the spontaneous
exchange bias (SEB) effect observed in spin glass (SG)-like systems. As in a
previously proposed model (Ref. 1), it is based on the unconventional dynamics
of the SG-like moments at the magnetic hysteresis cycle. However, using a
reliable estimate of the amount of SG-spins that are relaxing during the cycle,
the new model can correctly describe the changes in the SEB observed for
measurements performed at different temperatures and different maximum applied
fields.
