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Magnetostructural coupling and magnetocaloric effect in Ni–Mn–In

Appl. Phys. Lett. 95, 172506 (2009); doi:10.1063/1.3257381

Published 28 October 2009

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B. Li, W. J. Ren, Q. Zhang, X. K. Lv, X. G. Liu, H. Meng, J. Li, D. Li, and Z. D. Zhang
Shenyang National Laboratory for Material Science, Institute of Metal Research, and International Centre for Material Physics, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, People's Republic of China
Magnetic-field-induced martensitic phase transition and the concomitant change of volume are investigated in Ni–Mn–In alloy. A well-defined linear relationship is found between the quantity characterizing magnetic degree of freedom and the thermal expansion on behalf of structural degree of freedom, which demonstrates the magnetostructural coupling. Within the exchange-inversion model, such a linear relationship is theoretically derived and the magnetostructural correlation is elucidated. The lattice-entropy change contributes about one half of the total entropy change, suggesting that the magnetostructural coupling plays an important role in the magnetocaloric effect of Ni–Mn–In alloy. ©2009 American Institute of Physics
History: Received 9 September 2009; accepted 8 October 2009; published 28 October 2009
Permalink: http://link.aip.org/link/?APPLAB/95/172506/1
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KEYWORDS and PACS

Keywords
PACS
  • 75.30.Sg
    Magnetocaloric effect, magnetic cooling (magnetically ordered materials)
  • 81.30.Kf
    Martensitic transformations
  • 81.30.Hd
    Constant-composition solid-solid phase transformations: polymorphic, massive, and order-disorder
  • YEAR: 2009

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ISSN:
0003-6951 (print)   1077-3118 (online)
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