Pressure induced magnetic and magnetocaloric properties in NiCoMnSb Heusler alloy

TL;DR

This study investigates how pressure influences the magnetic and magnetocaloric properties of NiCoMnSb Heusler alloy, revealing pressure-induced shifts in transition temperatures and potential for room-temperature magnetic refrigeration.

Contribution

It demonstrates that applying pressure and adjusting Co concentration can tune the magnetocaloric effect in NiCoMnSb alloys, enhancing their suitability for magnetic refrigeration.

Findings

Pressure shifts martensitic transition to higher temperatures.

Maximum magnetic entropy change is 41.4 J/kg K at ambient pressure.

Giant magnetocaloric effect achievable near room temperature.

Abstract

The effect of pressure on the magnetic and the magnetocaloric properties around the martensitic transformation temperature in NiCoMnSb Heusler alloy has been studied. The martensitic transition temperature has significantly shifted to higher temperatures with pressure, whereas the trend is opposite with the application of applied magnetic field. The maximum magnetic entropy change around the martensitic transition temperature for Ni45Co5Mn38Sb12 is 41.4 J/kg K at the ambient pressure, whereas it is 33 J/kg K at 8.5 kbar. We find that by adjusting the Co concentration and applying suitable pressure, NiCoMnSb system can be tuned to achieve giant magnetocaloric effect spread over a large temperature span around the room temperature, thereby making it a potential magnetic refrigerant material for applications.