Ultra-low-field magneto-elastocaloric cooling in a multiferroic composite device

TL;DR

This paper demonstrates an ultra-low-field magneto-elastocaloric cooling device using a multiferroic composite that achieves significant temperature change with minimal magnetic field, promising efficient and compact cooling solutions.

Contribution

It introduces a novel composite magneto-elastocaloric device operating at ultra-low magnetic fields, combining magnetostriction and superelastic alloys for efficient cooling.

Findings

Achieves 4 K temperature change at 0.16 T magnetic field

Uses a compact composite device with magnetostriction/superelastic alloys

Circumvents high-stress and high-field requirements of existing technologies

Abstract

The advent of caloric materials for magnetocaloric, elastocaloric, and electrocaloric cooling is changing the landscape of solid state cooling technologies with potentials for high-efficiency and environmentally-friendly residential and commercial cooling as well as heating applications. Given that caloric materials are ferroic materials which undergo first (or second) order transitions near room temperature, they open up intriguing possibilities for novel multiferroic devices with hitherto unexplored functionalities coupling their thermal properties with different fields (magnetic, electric, and stress) through composite configurations. Here, we demonstrate a composite magneto-elastocaloric effect with ultra-low magnetic field (0.16 T) in a compact geometry to generate a cooling temperature change as large as 4 K using a magnetostriction/superelastic alloy composite. Such composite systems can be used to circumvent shortcomings of existing technologies such as the need for high-stress actuation mechanism for elastocaloric materials and the high magnetic-field requirement of magnetocaloric materials, while enabling new applications such as compact remote cooling devices.