Peculiarities of the magnetocaloric properties in Ni-Mn-Sn ferromagnetic shape memory alloys

V. V. Khovaylo, K. P. Skokov, O. Gutfleisch, H. Miki, T. Takagi, T. Kanomata, V. V. Koledov, V. G. Shavrov, G. Wang, E. Palacios, J. Bartolomé, R. Burriel

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Abstract

Magnetocaloric properties of a Ni50Mn36Co 1Sn13 ferromagnetic shape memory alloy have been studied experimentally in the vicinity of a first-order magnetostructural phase-transition low-temperature paramagnetic martensite high-temperature ferromagnetic austenite. The magnetic entropy change Δ Sm calculated from the magnetization M (T) data measured upon cooling is higher than that estimated from M (T) measured upon heating. Contrary to Δ Sm, the adiabatic temperature change Δ Tad measured upon cooling is significantly smaller than that measured upon heating. The apparent discrepancy between Δ Sm and Δ Tad (larger Δ Sm, smaller Δ Tad upon cooling, and smaller Δ Sm, larger Δ Tad upon heating) is caused by the hysteretical behavior of this magnetostructural transition, a feature common for all the alloys in the family of Ni50Mn25+xZ25-x (Z=In,Sn,Sb) ferromagnetic shape memory Heusler compounds. The hysteresis causes the magnetocaloric parameters to depend strongly on the temperature and field history of the experimental processes.

Original languageEnglish
Article number214406
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume81
Issue number21
DOIs
Publication statusPublished - 2010 Jun 7

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Khovaylo, V. V., Skokov, K. P., Gutfleisch, O., Miki, H., Takagi, T., Kanomata, T., Koledov, V. V., Shavrov, V. G., Wang, G., Palacios, E., Bartolomé, J., & Burriel, R. (2010). Peculiarities of the magnetocaloric properties in Ni-Mn-Sn ferromagnetic shape memory alloys. Physical Review B - Condensed Matter and Materials Physics, 81(21), [214406]. https://doi.org/10.1103/PhysRevB.81.214406