Ferromagnetic interactions and martensitic transformation in Fe doped Ni-Mn-In shape memory alloys

Abstract

The structure, magnetic and martensitic properties of Fe doped Ni-Mn-In magnetic shape memory alloys have been studied by differential scanning calorimetry, magnetization, resistivity, X-ray diffraction (XRD) and EXAFS. While Ni${}_2$MnIn${}_{1-x}$Fe${}_x$ ($0\le x\le 0.6$) alloys are ferromagnetic and non martensitic, the martensitic transformation temperature in Ni${}_2$Mn${}_{1.5}$In${}_{1-y}$Fe${}_y$ and Ni${}_2$Mn${}_{1.6}$In${}_{1-y}$Fe${}_y$ increases for lower Fe concentrations ($y\le 0.05$) before decreasing sharply for higher Fe concentrations. XRD analysis reveals presence of cubic and tetragonal structural phases in Ni${}_2$MnIn${}_{1-x}$Fe${}_x$ at room temperature with tetragonal phase content increasing with Fe doping. Even though the local structure around Mn and Ni in these Fe doped alloys is similar to martensitic Mn rich Ni-Mn-In alloys, presence of ferromagnetic interactions and structural disorder induced by Fe affect Mn-Ni-Mn antiferromagnetic interactions resulting in suppression of martensitic transformation in these Fe doped alloys.

Accepted for publication in J. Appl. Phys

References in corpus (4)

• Large zero-field cooled exchange-bias in bulk Mn2PtGa
• Phase diagram of Fe-doped Ni-Mn-Ga ferromagnetic shape-memory alloys
• Local Atomic Structure of Martensitic Ni${}_{2+x}$Mn${}_{1-x}$Ga: An EXAFS Study
• Ferromagnetic interactions and martensitic transformation in Fe doped Ni-Mn-In shape memory alloys

Cited by in corpus (2)

• Ferromagnetic interactions and martensitic transformation in Fe doped Ni-Mn-In shape memory alloys
• Strain glass versus antisite disorder induced ferromagnetic state in Fe doped Ni-Mn-In Heusler martensites