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Magnetic entropy change in the Ge-rich alloys Gd-Si-Ge

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3 Author(s)
Yi Zhuo ; Inst. de Recherche sur l'Hydrogene, Quebec Univ., Trois-Rivieres, Que., Canada ; R. Chahine ; T. K. Bose

We have studied the temperature and field dependence of the magnetocaloric effect in the Ge-rich alloys Gd5(SixGe1-x)4, where x=0.0825, 0.15, and 0.1875. The low field susceptibility shows a two-step magnetic ordering at the Curie temperature TC and the Neel temperature TN. The TC of the different compositions covers the temperature range 67 K-108 K while TN remains constant at around 133 K. The magnetic entropy change ΔSM(T) as a function of applied field up to 7 Tesla is characterized by a second-order magnetic phase transition around TN and a first-order transition around TC. The maximum magnetic entropy change around TN is only about 3 J·kg-1·K-1, but it is much larger around TC. It rapidly reaches a saturation plateau of about 40-50 J·kg-1·K-1, which widens with increasing field. The width of the plateau at an applied field of 7 T is about 20 K. These results indicate that the Ge-rich alloys are potentially good candidates for MR applications at low temperature.

Published in:

IEEE Transactions on Magnetics  (Volume:39 ,  Issue: 5 )