  The exchange bias (EB) phenomenon has been found in Nd2/3Ca1/3MnO3
perovskite. The phenomenon manifests itself as a negative horizontal shift of
magnetization hysteresis loops. The EB phenomenon is evident of an interface
exchange coupling between coexisting antiferromagnetic (AFM) and ferromagnetic
(FM) phases and confirms the phase separated state of the compound at low
temperatures. The EB effect is found to be strongly dependent on the cooling
magnetic field and the temperature, which is associated with the evolution of
spontaneous AFM - FM phase separated state of the compound. Analysis of
magnetic hysteresis loops has shown that ferromagnetic moment $M_{FM}$
originating from the FM clusters saturates in a relatively low magnetic field
about H ~ 0.4T. The obtained saturation value $M_{FM}$(1T) ~ 0.45$\mu_{B}$ is
in a good agreement with our previous neutron diffraction data.
