Abstract
Temperature and field dependence of magnetization of Dy-substituted Gd5Si2Ge2 compounds has been studied in the temperature range of 5–330K. The (DyxGd5−x)Si2Ge2 compounds with x=0.5, 1.5, 3.0, and 3.5 are found to order ferromagnetically with magnetic ordering temperature TC ranging between ∼270 and 80K. The Dy substitution in Gd5Si2Ge2 leads to a lowering of TC, an increase in coercivity, and also to a loss of the first order magnetic phase transition seen in the parent compound. The magnetic entropy change ΔSM associated with the magnetic transition has been computed using the magnetization-field isotherm data. The maximum magnetic entropy changes of ∼8.8, 13.9, and 6.9J∕kgK are obtained for x=0.5, 3.0, and 5 compounds, respectively, for a field change of 55kOe. The ΔSM is spread around TC over a few tens of Kelvin and this feature makes these materials promising for possible use in Ericsson-cycle magnetic refrigerator applications.
Published Version
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