Abstract:
The new unic measurement setup for the simultaneous measurement of magneto-thermal
and magnetostrictive properties of magnetic materials was made. A complex investigation
of the magnetocaloric and magneto-volume effects of the DyCo$_2$ compound with the first
order metamagnetic transition were carried out. It was found that the magnitude of
the magneto-volume effect in the DyCo${}_2$ compound under the adiabatic magnetic field
change is 20% less than under isothermal conditions. This effect is explained by the fact
that during the adiabatic magnetization, the temperature of the sample changes due
to magnetocaloric effect, which leads to the sample goes from the demagnetized state
to a magnetized one along a way that does not correspond to the maximum effect. This
behavior of the material should occur in the real magnetic solid-state heat pump designing.