Статья «The role of Mn in the stabilization of adiabatic temperature changes of LaFe11.22xMnxCo0.7Si1.1 alloys in an alternating magnetic field» А. Гамзатова, Н. Абдулкадировой, К. Камилова, А. Батдалова, А. Алиева, П. Гебара и Х. Жанг опубликована в журнале RARE METALS (Springer Nature)
The results of the study of the effect of partial substitution of Fe by Mn in the LaFe11.2-xMnxCo0.7Si1.1 system on magnetization, specific heat, magnetostriction and magnetocaloric effect are presented. Direct measurements of the adiabatic temperature change (DTad) were carried out in AC magnetic fields using the magnetic field modulation method. Partial substitution of Fe atoms by Mn atoms leads to a shift in the Curie temperature (TC) towards lower temperatures without a noticeable deterioration in magnetic properties. A correlation was found between the structural component of the magnetocaloric effect and the stability of the frequency of the DTad in the AMFs—an increase in the manganese concentration leads to a decrease in magnetostriction and to a lower dependence of DTad on the frequency of the magnetic field. Estimates of the specific cooling power QC as a function of the frequency of the AMF showed that the highest value of QC at f = 20 Hz in a magnetic field of 12 kOe is 26.3 W g-1 and is observed for the composition with x = 0.1. This value is higher than that of Gd, for which, under the same conditions, QC = 21.6 W g-1. All the samples studied show stability of the value of DTad without any sign of deterioration of the effect up to 60,000 cycles of switching on/off of the magnetic field of 12 kOe. The discovered frequency and cyclic stability of DTad of the studied samples increase their prospects for application in magnetic cooling technology.
