Magnetostress and multicaloric effect in Ni44.1Co5.0Mn36.1In13.4Cu1.4 polycrystalline alloy

Abstract

In this Letter, we report on a large magnetic field-induced stress of 14.4 MPa/T and a low stress hysteresis of 50 MPa in a polycrystalline Ni44.1Co5.0Mn36.1In13.4Cu1.4 alloy, rendering it as a promising candidate for high-energy output and high-efficient actuators. The large magnetostress mainly originates from the large transformation entropy change of 15.4 J/(kg K) and the high sensitivity of phase transformation temperature to the magnetic field of −9.2 K/T. Furthermore, we have explored the possibility by adopting multicaloric strategy to enhance the transformation reversibility and widen the cooling temperature window. Unexpectedly, the application of the magnetic field has little impact on the elastocaloric temperature change, which might be ascribed to the large magnetization character of ferromagnetic austenite phase and the non-synergic spin-lattice transformation behavior in the Ni44.1Co5.0Mn36.1In13.4Cu1.4 alloy.