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Comportements hystérétiques des matériaux magnétocaloriques à transition de phase de premier ordre.

Hysteretic behaviours of first-order phase transition magnetocaloric materials.

Auteurs : TEGUS O., ZHANG L., TRUNG N. T., et al.

Résumé

The hysteretic behaviour of some first-order magnetic phase transition materials with large magnetocaloric effect has been investigated by means of magnetic measurements. An unusual phase transition, so called 'virgin' effect, exists in some Mn-based compounds, but not in the Gd(5)[Si,Ge]4 and La(Fe,Si)13 compounds. In thermal hysteretic regime, the magnetic behaviour of the first-order phase transition materials strongly depends on the history of thermal and field cycles. A reversible field-induced phase transition is important for producing a reversible large magnetocaloric effect. The mechanism of thermal hysteresis is discussed on the basis of Landau theory by taking into account the coupling between magnetization and strain.

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Pages : 2009-3

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Détails

  • Titre original : Hysteretic behaviours of first-order phase transition magnetocaloric materials.
  • Identifiant de la fiche : 2009-1610
  • Langues : Anglais
  • Source : 3rd International Conference on Magnetic Refrigeration at Room Temperature
  • Date d'édition : 11/05/2009

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