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We report the exchange bias (EB) effect along with tunnelingmagnetoresistance (MR) in polycrystalline La_{0.88}Sr_{0.12}CoO_3. Analogous tothe shift in the magnetic hysteresis loop along the field (H)-axis a shift isclearly observed in the MR-H curve when the sample is cooled in a staticmagnetic field. Training effect (TE) is a significant manifestation of EBeffect which describes the decrease of EB effect when sample is successivelyfield-cycled at a particular temperature. We observe TE in the shift of theMR-H curve which could be interpreted by the spin configurational relaxationmodel. A strong field-cooled (FC) effect in the temperature as well as timedependence of resistivity is observed below spin freezing temperature. Theunusual MR results measured in FC mode are interpreted in terms ofintragranular interface effect between short range ferromagnetic clusters andspin-glass matrix giving rise to the EB effect. EB effect in MR has beenobserved in bilayer or multilayer films which has not yet seen in apolycrystalline compound. EB effect involved with tunneling MR andsemiconducting transport property attributed to the intragranular intrinsicnanostructure is promising for the spintronic applications.

Exchange bias effect involved with tunneling magnetoresistance in polycrystalline La_{0.88}Sr_{0.12}CoO_3