Abstract
The perovskite La0.67Pb0.33MnO3 with a Curie temperature TC=360K has been characterized by measuring the zero-field-cooled(ZFC) and field-cooled(FC) moments over a wide range of temperature 2K<T<380K in the applied field of ha=3978.87A/m, and also the major hysteresis loop over the field range |ha|≤160kA/m at T=10K. The data have been analysed within the framework of a generalized version of the Preisach model of the hysteresis,which combines thermal fluctuations with the growth of the free energy barriers below TC. Numerical simulations replicate all of the principal structural systematics of the data, including the hystersis loop and the magnetization and the susceptibility under the ZFC/FC conditions. Finally, the details of the spectrum of Barkhausen instabilities are discussed in this material.
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