Large relative cooling power in van der Waals room-temperature ferromagnet Fe5GeTe2.

Due to the unique structures, van der Waals (vdW) materials have advantages over traditional magnetothermal materials in manipulating magnetothermal properties through structural modification and in cooling applications in nanodevices. Here, we study the magnetothermal properties of vdW ferromagnet Fe₅GeTe₂ with Curie temperature around room temperature. The results show that Fe₅GeTe₂ is a second-order magnetic phase transition material, and its in-plane and out-of-plane values of relative cooling power are large up, respectively, to 299.3 and 269.2 J/kg for a field change of 5 T. Compared to other vdW materials reported, Fe₅GeTe₂ has the greatest potential for room-temperature magnetic cooling applications. [ABSTRACT FROM AUTHOR]