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Zero field cooled spontaneous exchange bias (SEB) is observed in epitaxialLa0.7Sr0.3MnO3 (LSMO):NiO self-assembled nanocomposite thin films grown on(001) SrTiO3 single crystal substrate by pulsed laser deposition. SEB isdisplayed by the novel asymmetry in the hysteresis loop of the composite filmalong with the field cooled conventional exchange bias (CEB) effect. Thetraining effect shows that exchange bias relaxation is disorder mediated. It isrevealed from DC magnetization results that such nanocomposite film divulgesspin glass like behaviour, which is arising due to competing ferromagnetic andantiferromagnetic inteactions at the assorted interfaces of ferromagnetic LSMOand antiferromagnetic NiO. Also corroborated by x-ray magnetic circulardichroism (XMCD) measurements, we conclude that SEB is mainly originating dueto ferromagnetic coupling of unstable interfacial antiferromagnetic spin due toNiO with the ferromagnetic LSMO at the disordered interface. These results ofself-assembled thin films provide a useful input to realize and understandmicroscopic origin of SEB for device application.

Interfacial spin glass mediated unusual spontaneous exchange bias effect in epitaxial self-assembled La0.7Sr0.3MnO3:NiO nanocomposite thin films