Preisach analysis of (La_0.2Nd_0.8)_0.67Pb_0.33MnO₃

The perovskite (La_0.2Nd_0.8)_0.67Pb_0.33MnO₃ (LNPMO) with a Curie temperature T_C=220K has been characterized by measuring the zero field cooled (ZFC) and field cooled (FC) moments over wide range of temperature 2K < T < 290K in an applied field of H_a = 3978.87 A/m, and also by the major hysteresis loop over the field range H_a \leq1061kA/m at T=10K. The data analysed within the framework of a generalized Preisach model, which includes thermal fluctuations, critical effects, and a temperature-dependent distribution of free energy barriers. The analysis shows that the response function of LNPMO is dominated by the growth of the anisotropy barriers.