Magnetic interactions in the Martensitic phase of Mn rich Ni-Mn-In shape memory alloys

Abstract

The magnetic properties of Mn${}_2$Ni${}_{(1+x)}$In${}_{(1-x)}$ ($x$ = 0.5, 0.6, 0.7) and Mn${}_{(2-y)}$Ni${}_{(1.6+y)}$In${}_{0.4}$ ($y$ = -0.08, -0.04, 0.04, 0.08) shape memory alloys have been studied. Magnetic interactions in the martensitic phase of these alloys are found to be quite similar to those in Ni${}_2$Mn${}_{(1+x)}$In${}_{(1-x)}$ type alloys. Doping of Ni for In not only induces martensitic instability in Mn${}_2$NiIn type alloys but also affects magnetic properties due to a site occupancy disorder. Excess Ni preferentially occupies X sites forcing Mn to the Z sites of X${}_2$YZ Heusler composition resulting in a transition from ferromagnetic ground state to a state dominated by ferromagnetic Mn(Y) - Mn(Y) and antiferromagnetic Mn(Y)-Mn(Z) interactions. These changes in magnetic ground state manifest themselves in observation of exchange bias effect even in zero field cooled condition and virgin magnetization curve lying outside the hysteresis loop.

Accepted in J. Appl. Phys

References in corpus (7)

• Large zero-field cooled exchange-bias in bulk Mn2PtGa
• Room Temperature Magnetocaloric Effect in Ni-Mn-In
• Martensitic transition, ferrimagnetism and Fermi surface nesting in Mn_2NiGa
• Antiferromagnetic Exchange Interactions in Ni${}_2$Mn${}_{1.4}$In${}_{0.6}$ ferromagnetic Heusler alloy
• Role of Ni-Mn hybridization in magnetism of martensitic state of Ni-Mn-In shape memory alloys
• Correlation between Local Structure Distortions and Martensitic Transformation in Ni-Mn-In alloys
• Anomalous Magnetic Properties in Ni50Mn35In15

Cited by in corpus (2)

• Ferromagnetic interactions and martensitic transformation in Fe doped Ni-Mn-In shape memory alloys
• Effect of site occupancy disorder on Martensitic properties of Mn${}_2$NiIn type alloys: x-ray absorption fine structure study