Magnetic and Magnetocaloric Study of the Ferromagnetically Coupled GdF3: The Best Cryogenic Magnetic Coolant Ever

TL;DR

This study demonstrates that GdF3 exhibits an exceptionally large magnetocaloric effect, making it the most effective cryogenic magnetic coolant known, due to its magnetic properties and structure.

Contribution

The paper reports the first detailed magnetic and magnetocaloric characterization of GdF3, highlighting its superior performance as a cryogenic magnetic coolant.

Findings

GdF3 shows an extremely large isothermal entropy change of 528 mJ cm-3 K-1 at 9 T.

GdF3's magnetic properties are due to Gd3+'s large isotropic spin and its dense structure.

It outperforms existing cryogenic magnetic coolants in magnetocaloric efficiency.

Abstract

The magnetic susceptibility and isothermal magnetization for GdF3 were measured, and the isothermal entropy change was evaluated up to 9 T. Combining the large isotropic spin of Gd3+, the dense structure and the weak ferromagnetic interaction, an extremely large -(delta)Sm for GdF3 was observed up to 528 mJ cm-3 K-1 for (delta)H = 9 T, proving itself to be the best cryogenic magnetic coolant ever.