Nanosized La_0.4Gd_0.2Sr_0.4MnO₃ manganites: From magnetic refrigeration to hyperthermia method

The structural, magnetic, and magnetocaloric characteristics of the nanosized La0.4Gd0.2Sr0.4MnO3 manganites were discussed based on the influence of heating temperature (700 and 1000 degrees C). We investigated it, further, to present the strong link between magnetic refrigeration and hyperthermia technique. Both samples are nanosized according to the study of the scanning electron microscopy and the X-ray diffraction patterns (Scherrer and Williamson-Hall plots). Analyzing the thermal evolution of the magnetizations proves that various magnetic states are present in both samples, superparamagnetism, spin-glass, ferromagnetism, and paramagnetism. We demonstrated that the Curie temperature is between 318 and 331 K, which is the ideal range for the hyperthermia approach. The relative cooling power at 6 T is around 404.085 J/Kg for LGSM_1000; thus, this sample is an excellent candidate for magnetic cooling. It is a great achievement result that the rate of evolution from LGSM_700 to LGSM_1000 is 3213.26 %.