Anti-site disorder and improved functionality of Mn$_{2}$Ni{\it X} ({\it X}= Al, Ga, In, Sn) inverse Heusler alloys

Souvik Paul; Ashis Kundu; Biplab Sanyal; Subhradip Ghosh

doi:10.1063/1.4896906

paper

Anti-site disorder and improved functionality of Mn $_{2}$ Ni{\it X} ({\it X}= Al, Ga, In, Sn) inverse Heusler alloys

arXiv:1410.1690 · doi:10.1063/1.4896906

Abstract

Recent first-principles calculations have predicted Mn $_{2}$ Ni{\it X} ({\it X}=Al, Ga, In, Sn) alloys to be magnetic shape memory alloys. Moreover, experiments on Mn $_{2}$ NiGa and Mn $_{2}$ NiSn suggest that the alloys deviate from the perfect inverse Heusler arrangement and that there is chemical disorder at the sublattices with tetrahedral symmetry. In this work, we investigate the effects of such chemical disorder on phase stabilities and magnetic properties using first-principles electronic structure methods. We find that except Mn $_{2}$ NiAl, all other alloys show signatures of martensitic transformations in presence of anti-site disorder at the sublattices with tetrahedral symmetry. This improves the possibilities of realizing martensitic transformations at relatively low fields and the possibilities of obtaining significantly large inverse magneto-caloric effects, in comparison to perfect inverse Heusler arrangement of atoms. We analyze the origin of such improvements in functional properties by investigating electronic structures and magnetic exchange interactions.

Anti-site disorder and improved functionality of Mn $_{2}$ Ni{\it X} ({\it X}= Al, Ga, In, Sn) inverse Heusler alloys

Abstract

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Anti-site disorder and improved functionality of Mn2​Ni{\it X} ({\it X}= Al, Ga, In, Sn) inverse Heusler alloys

Abstract

References in corpus (4)

Cited by in corpus (4)

Anti-site disorder and improved functionality of Mn $_{2}$ Ni{\it X} ({\it X}= Al, Ga, In, Sn) inverse Heusler alloys