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Magnetocaloric effect (MCE) in melt-extracted Ni–Mn–Ga–Fe Heusler microwires

Authors
Journal
Journal of Alloys and Compounds
0925-8388
Publisher
Elsevier
Identifiers
DOI: 10.1016/j.jallcom.2014.07.077
Keywords
  • Ferromagnetic Shape Memory Alloys
  • Ni–Mn–Ga–Fe Microwires
  • Magnetocaloric Effect (Mce)
  • Martensitic Phase Transformation
Disciplines
  • Chemistry
  • Physics

Abstract

Abstract We reported the magnetocaloric properties of Heusler-type Ni48Mn26Ga19.5Fe6.5 microwires with diameter of ∼50μm which were fabricated by a precise melt-extraction method. The Fe-doped Ni–Mn–Ga microwires after chemical ordering heat-treatment exhibit negligible thermal and magnetic hysteresis along the axial direction due to their small magnetocrystalline anisotropy and display excellent magnetocaloric effect (MCE) for both magnetic (paramagnetic–ferromagnetic) phase transition and structural (austenite–martensite) phase transition. The maximum entropy change (−ΔSm), ∼4.7Jkg−1K−1, is obtained during the structural transition induced by an external magnetic field of 50kOe at a temperature of ∼361K. Moreover, tiny positive magnetic entropy also appears when the applied field is lower than 5kOe.

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