Influence of Magnetic Field on Magnetostructural Transition in Ni46.4Mn32.8Sn20.8 Heusler Alloy

Patricia Lázpita; Volodymyr A. Chernenko; José M. Barandiarán; Iñaki Orue; Jon Gutiérrez; Jorge Feuchtwanger; José Alberto Rodriguez-Velamazán

doi:10.4028/www.scientific.net/MSF.635.89

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HomeMaterials Science ForumMaterials Science Forum Vol. 635Influence of Magnetic Field on Magnetostructural...

Influence of Magnetic Field on Magnetostructural Transition in Ni_46.4Mn_32.8Sn_20.8 Heusler Alloy

Abstract:

A Mn-enriched Ni46.4Mn32.8Sn20.8 Heusler alloy has been prepared by the induction melting and casting method. The samples used were annealed at 900°C during 72 h with a subsequent water quench. The magnetostructural transformation (MST) in the vicinity of Tm=230K and Ta=250K has been found, and characterized by DSC, magnetization and resistivity measurements. Changes in the crystal structure due to the MST were observed using neutron diffraction at different temperatures. The crystal structure of martensitic phase shows a good fits to the 4-layered orthorhombic martensite with a Pmma space group. The linear shift of transformation temperatures was found in the entire high magnetic field range up 14T to be dTm/dB0 = -1.50 K/T and dTa/dB0 = -1.26 K/T, whereas in the low field range we found an increase of both characteristic temperatures. The entropy changes at the MST were evaluated using the Clausius-Clapeyron relationship. The transformation-induced magnetoresistance has been measured.

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Materials Science Forum (Volume 635)

Pages:

89-95

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.635.89

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Online since:

December 2009

Authors:

Patricia Lázpita, Volodymyr A. Chernenko, José M. Barandiarán, Iñaki Orue, Jon Gutiérrez, Jorge Feuchtwanger, José Alberto Rodriguez-Velamazán

Keywords:

Heusler Alloy, Magnetostructural Transition, Martensitic Structure, Ni_46.4Mn_32.8Ga_20.8

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