Ultra-Low-Field Magneto-Elastocaloric Cooling in a Multiferroic Composite Device
Journal Article - Open Access
NAVAL RESEARCH LAB WASHINGTON DC WASHINGTON United States
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The advent of caloric materials for magnetocaloric, electrocaloric, and elastocaloric cooling is changing the landscape of solid state cooling technologies with potentials for high-efficiency and environmentally friendly residential and commercial cooling and heat-pumping applications. Given that caloric materials are ferroic materials that undergo first or second order phase transitions near room temperature, they open up intriguing possibilities for multiferroic devices with hitherto unexplored functionalities coupling their thermal properties with different fields magnetic, electric, and stress through composite configurations. Here we demonstrate a 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 magnetostrictionsuperelastic 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.
- Electricity and Magnetism