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Peak Magnetocaloric Effects in Al-Gd-Fe Alloys

Published

Author(s)

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

Abstract

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.
Citation
Journal of Applied Physics

Keywords

antiferromagnetic, ferromagnetic, magnetic entropy, magnetocaloric, ternary alloys

Citation

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], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=853308 (Accessed February 29, 2024)
Created June 1, 2004, Updated February 17, 2017