Limit field of the AF–F transition in FeRh

Abstract

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.