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Transition magnétostructurelle et effet magnétocalorique dans des alliages de Ni-Mn-In-(Co).

Magnetostructural transition and magnetocaloric effect in Ni-Mn-In-(Co) alloys.

Auteurs : LIU J., LYUBINA J., GUTFLEISCH O.

Résumé

A study of the magnetostructural transition and magnetocaloric effect in Ni-Mn-In-(Co) bulk and ribbon samples was carried out. A significant shift of martensitic transition temperature by the application of the magnetic field occurs below room temperature in Ni(50)Mn(34)In(16) bulk sample. The positive and negative magnetic entropy changes were obtained around structural and ferromagnetic transitions, respectively. To tune the martensitic transition close to room temperature, the application of pressure and the alloying of Co were performed. The martensitic transition temperature was increased by 35 K by applying a pressure of 9.6 kbar. In Ni(45)Mn(37)In(13)Co(5) bulk sample, a magnetostructural transition with a small hysteresis of 8 K was observed around 325 K. In contrary, Ni(45)Mn(37)In(13)Co(5) ribbon has a relatively large hysteresis of 18 K. The irreversible magnetostructural transition due to the large hysteresis leads to a variation in the magnetocaloric effect in dependence on sample prehistory.

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Pages : 2009-3

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Détails

  • Titre original : Magnetostructural transition and magnetocaloric effect in Ni-Mn-In-(Co) alloys.
  • Identifiant de la fiche : 2009-1612
  • Langues : Anglais
  • Source : 3rd International Conference on Magnetic Refrigeration at Room Temperature
  • Date d'édition : 11/05/2009

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