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

TL;DR

This study investigates the magnetocaloric properties of Heusler alloys, demonstrating that the magnetic entropy change depends linearly on valence electrons and predicting a new alloy with enhanced effects near room temperature.

Contribution

It provides experimental evidence linking valence electron count to magnetocaloric effects and predicts a new multifunctional Heusler alloy with improved properties.

Findings

Magnetic entropy change depends linearly on valence electrons.

Maximum entropy change scales with magnetic field as a power law.

Predicted a new alloy with near-room-temperature Curie point and half-metallicity.

Abstract

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