Tailoring magnetic and magnetocaloric properties of martensitic transitions in ferromagnetic Heusler alloys

TL;DR

This paper explores how substituting Ga for In in Ni$_{50}$Mn$_{34}$In$_{16}$ alloys adjusts the martensitic and magnetocaloric properties, aiming to optimize these effects near room temperature for practical applications.

Contribution

It demonstrates that small Ga substitutions can effectively tune the martensitic transition temperature close to room temperature in ferromagnetic Heusler alloys.

Findings

Martensitic transformation temperature shifts towards room temperature with Ga substitution.

Substantial magnetocaloric effects are observed near the adjusted transition.

Field-induced reverse martensitic transformation is demonstrated.

Abstract

Ni$_{50}$Mn$_{34}$In$_{16}$ undergoes a martensitic transformation around 250 K and exhibits a field induced reverse martensitic transformation and substantial magnetocaloric effects. We substitute small amounts Ga for In, which are isoelectronic, to carry these technically important properties to close to room temperature by shifting the martensitic transformation temperature.