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Kinetic arrest of the ferromagnetic state in Mn[Formula: see text]GaC and Ni[Formula: see text]MnGa composite
K R Priolkar1, R Nevgi1, E T Dias1
1School of Physical and Applied Sciences, Goa University, Taleigao Plateau, Goa, 403206 India.
Abstract:
The kinetics of the ferromagnetic to antiferromagnetic transition in Mn[Formula: see text]GaC can be arrested and its magnetic properties can be tuned by mixing a small amount ([Formula: see text] 10%) of Heusler Ni[Formula: see text]MnGa to Mn[Formula: see text]GaC. A detailed study of magnetic properties of composite mixtures of Mn[Formula: see text]GaC and Ni[Formula: see text]MnGa with different antiperovskite to Heusler ratio, reveals that the ferromagnetic Ni[Formula: see text]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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