Abstract
Magnetic properties and magnetocaloric effects (MCEs) of the intermetallic Gd1−xHoxNiIn (x=0−1) compounds have been evaluated by magnetization and heat capacity measurements. The Curie temperature TC can be tuned from near 100K to 20K by substituting Ho for Gd atoms. In addition, all the compounds with Ho atoms undergo two successive magnetic transitions with the decrease of temperature: a paramagnetic (PM) to ferromagnetic (FM) transition around TC and a spin-reorientation (SR) transition around 7−9K. It is found that both transitions contribute to the magnetic entropy change (ΔSM). For a field change of 5T, the maximum values of −ΔSM for Gd0.4Ho0.6NiIn are 6J/kgK at Tt=9K and 10J/kgK at TC=52K, respectively. These two −ΔSM peaks overlap partly and result in a wide working temperature range of MCE, and thus leading to the largest RC value of 443J/kg in the Gd1−xHoxNiIn system.
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