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Heusler alloys are widely studied due to their interesting structural andmagnetic properties, like magnetic memory shape ability, coupledmagneto-structural phase transitions and half-metallicity; ruled, for manycases, by the valence electrons number ($N_v$). The present work focuses on themagnetocaloric potentials of half-metals, exploring the effect of $N_v$ on themagnetic entropy change, preserving half-metallicity. The test bench is theSi-rich side of the half-metallic series Fe$_2$MnSi$_{1-x}$Ga$_x$. From theobtained experimental results it was possible to obtain $|\DeltaS|_{max}=\Delta H^{0.8}(\alpha+\beta N_v)$, i.e., the maximum magnetic entropychange depends in a linear fashion on $N_v$, weighted by a power law on themagnetic field change $\Delta H$ ($\alpha$ and $\beta$ are constantsexperimentally determined). In addition, it was also possible to predict a newmultifunctional Heusler alloy, with enhanced magnetocaloric effect, Curietemperature close to 300 K and half-metallicity.

Multifunctional Heusler alloy: experimental evidences of enhanced magnetocaloric properties at room temperature and half-metallicity