Adiabatic temperature change in ErAl2/metal PIT wires: A practical method for estimating the magnetocaloric response of magnetocaloric composites

TL;DR

This paper presents a practical method to estimate the magnetocaloric response of ErAl2-based PIT wires by analyzing the adiabatic temperature change considering core volume and heat capacity differences, applicable to various composites.

Contribution

A new quantitative analysis method for predicting adiabatic temperature change in magnetocaloric PIT wires before fabrication.

Findings

Adiabatic temperature change depends on core volume fraction and heat capacity.

The proposed formula accurately estimates magnetocaloric response.

Method applicable to various magnetocaloric composites.

Abstract

We report the adiabatic temperature change in ErAl2 magnetocaloric wires fabricated by a powder-in-tube (PIT) process. The adiabatic temperature change of the PIT wires is found to be determined by not only the volume fraction of ErAl2 core but also the magnitude relationship between the specific heat of the ErAl2 core and the metal sheath. We propose a quantitative analysis method for calculating the temperature and core volume fraction dependence of adiabatic temperature change in the PIT wire, whose formula is applicable to also various magnetocaloric composites, useful to estimate the magnetocaloric response prior to fabrication.