A calorimetric study of the magnetic fluid APG-832 subjected to an alternating magnetic field has been performed. The results have permitted a determination of the specific absorption rat, expressed per the mass unit of the ferrimagnetic contained in the ferrofluid studied. In order to determine the polydispersity of magnetic grains and other parameters of the sample, it was subjected to the measurements by the vibrating sample magnetometer and observations under a transmission electron microscope.
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