Magnetic field induced entropy change and magnetoelasticity in Ni-Mn-Ga alloys

Jordi Marcos, Antoni Planes, Lluís Mañosa, Fèlix Casanova, Xavier Batlle, Amílcar Labarta, and Benjamín Martínez
Phys. Rev. B 66, 224413 – Published 18 December 2002
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Abstract

The magnetocaloric effect that originates from the martensitic transition in the ferromagnetic Ni-Mn-Ga shape-memory alloy is studied. We show that this effect is controlled by the magnetostructural coupling at both the martensitic variant and magnetic domain length scales. A large entropy change induced by moderate magnetic fields is obtained for alloys in which the magnetic moment of the two structural phases is not very different. We also show that this entropy change is not associated with the entropy difference between the martensitic and the parent phase—arising from the change in the crystallographic structure—which has been found to be independent of the magnetic field within this range of fields.

  • Received 15 July 2002

DOI:https://doi.org/10.1103/PhysRevB.66.224413

©2002 American Physical Society

Authors & Affiliations

Jordi Marcos, Antoni Planes, and Lluís Mañosa

  • Departament d’Estructura i Constituents de la Matèria, Facultat de Física, Universitat de Barcelona, Diagonal, 647, E-08028 Barcelona, Catalonia, Spain

Fèlix Casanova, Xavier Batlle, and Amílcar Labarta

  • Departament de Física Fonamental, Facultat de Física, Universitat de Barcelona, Diagonal, 647, E-08028 Barcelona, Catalonia, Spain

Benjamín Martínez

  • Institut de Ciència de Materials de Barcelona, CSIC, E-08193 Bellaterra, Catalonia, Spain

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Issue

Vol. 66, Iss. 22 — 1 December 2002

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