High-magnetic field characterization of magnetocaloric effect in FeZrB(Cu) amorphous ribbons.

The magnetic and magnetocaloric properties of a series of Fe-rich FeZrB(Cu) amorphous ribbons were investigated under magnetic field values up to μ₀H of 8T. A correlation between the saturation magnetization and the maximum magnetic entropy change ∣ΔS_M^peak∣ is clearly evidenced. Although these metallic glasses show relatively low ∣ΔS^Mpeak∣ values (from 3.6 to 4.4 J kg^-1 K^-1 for μ₀ΔH=8T), the ΔS_M(T) curve broadens upon the increase in μ₀ΔH, giving rise to a large refrigerant capacity RC (above 900J kg^-1 for μ₀ΔH=8T). Using the universal curve method for rescaling the ΔS_M(T,μ₀ΔH) curves, we found a collapse of the curves around the Curie temperature. However, in the low-temperature range the curves do not match into a single one due to the existence of magnetic frustration. [ABSTRACT FROM AUTHOR]