Multicaloric effect in Fe48Rh52 alloy: case of combination magnetic field and uniaxial tension

TL;DR

This study investigates the multicaloric effect in Fe48Rh52 alloy under combined magnetic and mechanical stimuli, revealing a synergistic caloric response exceeding individual effects and emphasizing the importance of sample geometry and application protocol.

Contribution

It demonstrates the combined magnetic and uniaxial tension effects produce a synergistic multicaloric response in Fe48Rh52 alloy, highlighting factors influencing caloric effects beyond simple addition.

Findings

Inverse caloric effects observed for magnetocaloric and elastocaloric effects.

Synergistic multicaloric effect exceeds sum of individual effects.

Sample geometry and stress distribution significantly influence caloric measurements.

Abstract

Mono and multicaloric effects in Fe48Rh52 alloy under applied magnetic field, uniaxial tension and their combination were studied by direct method. It was found that for single cases, the inverse caloric effect was observed with delta TAD = -2.9 K (1T) at 330 K in the case of the magnetocaloric effect and delta TAD = -0.5 K (104 MPa) at 328 K in the case of the elastocaloric effect. The combination co-application of the external 1 T magnetic field and a 104 MPa tensile results to the observation of a synergistic effect with delta TAD = -3.4 K at 330 K when a, which exceeds similar values for mono caloric effects. As was shown from comparison of calculation and experiments multicaloric effect it is not a sum of mono caloric effects and several factors as geometry of the sample as well the protocol for applying external fields should be taken into account. It was shown that the distribution of mechanical stresses in the Fe48Rh52 sample with a geometry in the shape of a plate with holes is heterogeneous, which should be taken into account when measuring calorific effects using tension through holes