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Peak Magnetocaloric Effects in Al-Gd-Fe Alloys



Virgil Provenzano, Alexander J. Shapiro, T T. King, E R. Canavan, P Shirron, M J. DiPirro, Robert D. Shull


The magnetocaloric properties of several AlxGdyFez (with x+y+z=100) ternary alloys have been determined between 2-300 K. Three distinct peaks in the magnetic entropy change Sm vs T were found: a low temperature peak (near 10 K), an intermediate temperature peak (80-160 K) and a higher temperature peak (210-280 K). The low temperature peak coincides with a field-induced antiferromagnetic-to-ferromagnetic (AF/FM) transition; the intermediate and high temperature peaks are associated with other magnetic transitions. In fact, above 60 K these alloys exhibited superparamagnetic behavior and were found to possess enhanced Sm values, as predicted earlier for magnetic nanocomposites.
Journal of Applied Physics


antiferromagnetic, ferromagnetic, magnetic entropy, magnetocaloric, ternary alloys


Provenzano, V. , Shapiro, A. , King, T. , Canavan, E. , Shirron, P. , DiPirro, M. and Shull, R. (2004), Peak Magnetocaloric Effects in Al-Gd-Fe Alloys, Journal of Applied Physics, [online], (Accessed February 29, 2024)
Created June 1, 2004, Updated February 17, 2017