ABSTRACT
The magnetocaloric effect is the change of the temperature of the magnetic material during its adiabatic magnetising or demagnetizing. In the adiabatic process a pressure jump forms at the magnetic fluid-vacuum interface and, as a result of this process, the fluid at the free interface is deformed. In the alternating magnetic field, the magnetocaloric effect and the thermal expansion typical of the fluid result in the oscillations of the volume of the fluid with the frequency of the field oscillations. The magnetocaloric effect fulfils in this case the function of one of the possible mechanisms of electromagnetic excitation of elastic oscillations in the magnetic fluid. In addition to the release or absorption of heat in remagnetisation of the fluid, which is determined by the alignment of the ferromagnetic dipoles in the fields, the release or absorption of heat caused by the intrinsic magnetocaloric effect of the ferromagnetic phase also takes place.
