[en] By the thermodynamic cycles method using the model S-T diagram of the FeRh alloy in the AF-F transition region, it is shown that for inducing the transition adiabatically over the whole alloy volume, it is necessary to apply a magnetic field equal to or larger than a limit magnetic field H^↑_l. The latter field is well above the field necessary to apply to induce the transition isothermally at the same temperatures. Using magnetocaloric effect measurement data, it is found that the fields, at which the effect approaches saturation indeed greatly exceed the critical fields. The calculated H^↑_l values are close to the experimentally obtained ones

[en] The proposal involves a heat-pumping scheme based upon the first-order antiferromagnetism-ferromagnetism transition in FeRh alloy. Using the model S-T diagram for this alloy, the heat-pump cycles, are drawn up based on the transition latent heat absorption and emission when the transition is induced by applying magnetic field. The calculated values of heat coefficient φ for the cycles are ∼39 at ΔT=5 K and ∼30 at ΔT=10 K, where ΔT is the difference between the temperature surrounding and that of the heat receiver. These values are achieved using the comparatively low magnetic fields of ∼2x10⁶ A m^-1. The high values of φ, together with high value of cooling capacity, make it possible to consider Fe-Rh alloys as an effective magnetic heat-pump working body near the room temperature

[en] The elastocaloric effect, the electrical resistivity and the thermal expansion have been investigated in a quenched sample of Fe₄₉Rh₅₁ alloy. The giant negative temperature change, resulting from a tensile stress of 529 MN/m² applied to the sample, is found to be 5.17 K. Using the Clapeyron-Clausius equation, the entropy jump and the antiferromagnetism-ferromagnetism transformation latent heat have been determined, the transformation being induced by the tensile stress applied to this alloy. (orig.)

[en] The temperature dependences of the Young's modulus and internal friction of Fe₄₉Rh₅₁ alloy samples have been studied in the region 80-420 K including a first-order antiferro-ferromagnetic transition. Giant anomalies were discovered of the properties above the transition point at 320-380 K. The shapes and values of the anomalies were found to be strongly dependent on the heat treatment of the samples. (orig.)