It has been shown that Pm(ZFC)(B) curves in the temperature range (20 divided-by 80K) may be presented as: Pm(B,T) = P(O,T).psi[B/mu-oP(O,T)], where psi(T) is a scaling function. The temperature and magnetic field dependences of the critical current are studied. The magnetization relaxation is also investigated. The thermally activated relaxation rate R vs magnetic field and vs temperature is characterized by the topological transition in shielding currents and, consequently, in the Abrikosov vortices distribution. The activation energy U(o) is about 0.24eV.