An efficient control of Curie temperature $T_C$ in Ni-Mn-Ga alloys

TL;DR

This study investigates how adding a fourth element to Ni-Mn-Ga alloys affects their Curie temperature, revealing that certain substitutions can increase or decrease $T_C$ significantly.

Contribution

It provides new insights into tuning the Curie temperature of Ni-Mn-Ga alloys through specific elemental substitutions.

Findings

Ni substitution with Fe or Co increases $T_C$

Mn substitution with V decreases $T_C$

Ga substitution with In decreases $T_C$

Abstract

We have studied the influence of alloying with a fourth element on the temperature of ferromagnetic ordering $T_C$ in Ni-Mn-Ga Heusler alloys. It is found that $T_C$ increases or decreases, depending on the substitution. The increase of $T_C$ is observed when Ni is substituted by either Fe or Co. On the contrary, the substitution of Mn for V or Ga for In strongly reduces $T_C$.