Kinetic arrest of the ferromagnetic state in Mn[Formula: see text]GaC and Ni[Formula: see text]MnGa composite mixtures.
2021
The kinetics of the ferromagnetic to antiferromagnetic transition in Mn
$$_3$$
GaC can be arrested and its magnetic properties can be tuned by mixing a small amount (
$$\sim $$
10%) of Heusler Ni
$$_2$$
MnGa to Mn
$$_3$$
GaC. A detailed study of magnetic properties of composite mixtures of Mn
$$_3$$
GaC and Ni
$$_2$$
MnGa with different antiperovskite to Heusler ratio, reveals that the ferromagnetic Ni
$$_2$$
MnGa polarizes magnetic spins of the antiperovskite phase by creating a magnetic strain field in its vicinity. The Heusler phase acts as a defect centre whose influence on the magnetic properties of the majority antiperovskite phase progressively diminishes, creating a distribution of transition temperatures. Such strong interaction between the two phases of the mixture allows for tunability and control over the properties of such magneto-structurally transforming materials.
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