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We report the new results of exchange bias effect in Nd_{1-x}Sr_{x}CoO_3 forx = 0.20 and 0.40, where the exchange bias phenomenon is involved with theferrimagnetic (FI) state in a spontaneously phase separated system. Thezero-field cooled magnetization exhibits the FI (T_{FI}) and ferromagnetic(T_C) transitions at ~ 23 and \sim 70 K, respectively for x = 0.20. Thenegative horizontal and positive vertical shifts of the magnetic hysteresisloops are observed when the system is cooled through T_{FI} in presence of apositive static magnetic field. Training effect is observed for x = 0.20, whichcould be interpreted by a spin configurational relaxation model. Theunidirectional shifts of the hysteresis loops as a function of temperatureexhibit the absence of exchange bias above T_{FI} for x = 0.20. The analysis ofthe cooling field dependence of exchange bias field and magnetization indicatesthat the ferromagnetic (FM) clusters consist of single magnetic domain withaverage size around \sim 20 and ~ 40 \AA ~ for x = 0.20 and 0.40, respectively.The sizes of the FM clusters are close to the percolation threshold for x =0.20, which grow and coalesce to form the bigger size for x = 0.40 resulting ina weak exchange bias effect.

Exchange bias effect in the phase separated Nd_{1-x}Sr_{x}CoO_3 at the spontaneous ferromagnetic/ferrimagnetic interface