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Influence of the Magnetic Anisotropy on the Magnetic Entropy Change of {\rm Ni}_{2}{\rm Mn}({\rm Ga},{\rm Bi}) Memory Shape Alloy

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8 Author(s)
Leitao, J.C.V. ; CICECO & Phys. Dept., Univ. de Aveiro, Aveiro ; Rocco, D.L. ; Sequeira Amaral, J. ; de Souza Reis, M.
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The magnetocaloric effect (MCE) is a good chance to create a more efficient refrigeration technique, both in energy and environmental friendliness. On the search for materials with large MCE (mainly characterized by a great magnetic entropy variation) in a wide temperature range around room temperature, this work focuses on the widely studied Heusler alloy and the influence of bismuth alloying in the stoichiometry Ni2MnGa in an attempt to make the magnetic and structural transition temperatures, TC and TM, come closer, and therefore create a large MCE. In addition, we discuss the influence of alloying processes on the magnetic anisotropy. Our results have in fact increased TM and decreased TC, but Bi substitution in Ga site (from 0 up to 5%) has been insufficient to merge those two transitions. The maximum magnetic entropy change was found to be 3.8 J/kg.K for the pure sample (without Bi) and 2.2 J/kg.K for sample 4 (maximum Bi concentration).

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Magnetics, IEEE Transactions on  (Volume:44 ,  Issue: 11 )