Magnetoresistance and field-induced structural transitions in Ni50Mn50-xSnx Heusler alloys

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Large magnetoresistance effects were observed in Ni50Mn50-xSnx Heusler alloys for concentrations 13≤x≤16. The effects occur at the respective martensitic transition temperatures (TM), which can be tuned in temperature through variations in Sn concentration. The largest observed values of the magnetoresistance (Δρ/ρo) were -42% for x=14 at T≈250 K, and -23% above room temperature (T≈320 K) for the sample with x=13, where the magnetic field change was ΔH=5 T. Magnetization and X-ray diffraction measurements indicate that the origin of the observed magnetoresistance is a magnetically induced magnetostructural transition from a complex 10 M modulated orthorhombic phase containing some antiferromagnetic coupling to a ferromagnetic cubic L21 structure. © 2007 Elsevier B.V. All rights reserved.

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Journal of Magnetism and Magnetic Materials

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