Enhanced magnetocaloric properties of FeZr amorphous films by C ion implantation

Abstract For a high magnetic refrigeration efficiency, a large change of magnetic entropy (−ΔS M ) associated with a high relative cooling power (RCP) are highly desirable. Here, the ion implantation is used to enhance both parameters in FeZr amorphous films. A considerable enhancement of both (−ΔS M ) and RCP, from 0.66 to 1.01 J/kg K and 84.5 to 155.5 J/kg respectively, for the as-grown sample compared to the C-implanted sample is obtained for a magnetic field change of µ 0 ΔH=1.5 T. The increase of (−ΔS M ) and RCP values, are attributed to the increase of the magnetization and the chemical inhomogeneity, respectively upon C implantation.