Unusual magnetic and calorimetric properties of lanthanum-strontium manganite nanoparticles

•Magnetic and calorimetric properties of LSMO nanoparticles have been studied.•A mechanism of AC field-induced heat generation has been elucidated.•The ways to enhance heating efficiency of LSMO nanoparticles are outlined. Combined study of magnetization reversal and AC field-induced processes has been carried out for lanthanum-strontium manganite nanoparticles with an average particle size near 30 nm. Hysteretic behavior with magnetic anisotropy fields of the order of one hundred Oersteds is independently confirmed by magnetic and calorimetric measurements. The regularities of the AC field-induced heating processes occurring in magnetic fluids based on the synthesized nanoparticles are specified and linked to magnetic anisotropy characteristics. The ways to optimize nanoparticle parameters and experimental conditions for the achievement of maximal heating efficiency are outlined.