Two series of exchange-coupled [La 1 - x Ca x MnO 3 (4nm)/La 1 - y Ca y MnO 3 (4nm)] 1 5 multilayers (one with constant y=0.67 while x=0.33, 0.4, 0.48, and the other with constant x=0.4 while y=0.52, 0.75) were used to investigate the effect of the field cooling on both, the exchange-biasing field (H E B ) and the coercivity (H c ). Large magnetothermal irreversibilities result in spin-glass-like M(T) curves. Exchange bias appears below a blocking temperature T B ~70K. Between 5 and 70K, the M(H) loops exhibit an asymmetry between the magnetization reversal from +M to -M and that from -M to +M, which seems to depend strongly on the domain structure in the FM layers.