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We present a detailed magnetic study of the Pr1/3Ca2/3MnO3 manganite, wherewe observe the presence of small ferromagnetic (FM) domains (diameter ~ 10A)immersed within the charge-ordered antiferromagnetic (AFM) host. Due to theinteraction of the FM nanodroplets with a disordered AFM shell, thelow-temperature magnetization loops present exchange bias (EB) under cooling inan applied magnetic field. Our analysis of the cooling field dependence of theEB yields an antiferromagnetic interface exchange coupling comparable to thebulk exchange constant of the AFM phase. We also observe training effect of theEB, which is successfully described in terms of a preexisting relaxation modeldeveloped for other classical EB systems. This work provides the first evidenceof intrinsic interface exchange coupling in phase separated manganites.Comment: 7 pages, 6 figure

Intrinsic interface exchange coupling of ferromagnetic nanodomains in a charge ordered manganite