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 (8)

• Magnetic superelasticity and inverse magnetocaloric effect in Ni-Mn-In
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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