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Abstract: This paper presents modification for a model to express magnetic hysteresis loop and the calculation of hysteresis energy loss (HEL) for cobalt ferrite nanoparticles (CFNs) produced by modified citrate-gel method. A simulation of CFNs hysteretic loops was successfully carried out showing a good fitting between the calculated and experimental curve. In addition, HEL is predicted in an expression as a result of this modified model.

Abstract: The magnetocaloric effect (MCE) of BiFeO3(BFO)|La0.7Sr0.3MnO3(LSMO) thin films was investigated via phenomenological model. It is revealed that the values of magnetic entropy change, temperature range covering MCE, change of specific heat, and relative cooling power of BFO|LSMO films decrease dramatically with an increase of BFO. The simulation shows furthermore that these BFO|LSMO films have prospective importance in magnetic refrigerants over a wide temperature range, including cryogenic and room temperatures. The MCE parameters of BFO|LSMO films are significantly larger and comparable with some MCE ones of magnetic materials in previous works.