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

AuthorsKhovaylo, Vladimir; Wang, GaoFeng; Palacios, Elias; Bartolomé, Juan; Burriel, Ramón
Issue DateJun-2010
PublisherAmerican Physical Society
CitationPhysical Review B 81(21): 214406 (2010)
AbstractMagnetocaloric properties of a Ni50Mn36Co1Sn13 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 ΔSm calculated from the magnetization M(T) data measured upon cooling is higher than that estimated from M(T) measured upon heating. Contrary to ΔSm, the adiabatic temperature change ΔTad measured upon cooling is significantly smaller than that measured upon heating. The apparent discrepancy between ΔSm and ΔTad (larger ΔSm, smaller ΔTad upon cooling, and smaller ΔSm, larger ΔTad 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.
Description6 páginas, 6 figuras.-- PACS number(s): 75.30.Sg, 75.50.Cc.-- et al.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevB.81.214406
Appears in Collections:(ICMA) Artículos
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