Giant entropy change at the co-occurrence of structural and magnetic transitions in the Ni Mn Ga Heusler alloy |
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Authors: | L Pareti M Solzi F Albertini A Paoluzi |
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Institution: | (1) IMEM - CNR, Parco Area delle Scienze, 43010 Fontanini, Parma, Italy, IT;(2) INFM and Dipartimento di Fisica, Università di Parma, Parco Area delle Scienze, 43100, Parma, Italy, IT |
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Abstract: | We have studied the isothermal entropy change around a first-order structural transformation and in correspondence to the
second-order Curie transition in the ferromagnetic Heusler alloy Ni2.15Mn0.85Ga. The results have been compared with those obtained for the composition Ni2.19Mn0.81Ga, in which the martensitic structural transformation and the magnetic transition occur simultaneously. With a magnetic field
span from 0 to 1.6 T, the magnetic entropy change reaches the value of 20 J/kg K when transitions are co-occurring, while
5 J/kg K is found when the only structural transition occurs.
Received 27 September 2002 / Received in final form 17 February 2003 Published online 11 April 2003
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ID="a"e-mail: solzi@fis.unipr.it |
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Keywords: | PACS 75 30 Sg Magnetocaloric effect magnetic cooling – 81 30 Kf Martensitic transformations – 75 50 Cc Other ferromagnetic metals and alloys – 75 30 Kz Magnetic phase boundaries (including magnetic transitions metamagnetism etc ) |
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