Hard magnetic properties and magnetocaloric effect in amorphous NdFeAl ribbons

• Published in: Journal of alloys and compounds Vol. 316; no. 1; pp. 260 - 263
• Main Authors: Si, L., Ding, J., Wang, L., Li, Y., Tan, H., Yao, B.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 02.03.2001; Elsevier
• Subjects: Amorphous materials; Applied sciences; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Magnetic measurements; Magnetic properties and materials; Magnetically ordered materials: other intrinsic properties; Magnetocaloric effect, magnetic cooling; Metals. Metallurgy; Physics; Rare earth alloys; Transition metal alloys; Rare earth alloys; Magnetic measurements; Amorphous materials; Transition metal alloys; Moessbauer effect; Curie point; Magnetization; Ternary alloys; Melt spinning; Amorphous alloy; Entropy; Iron alloys; Amorphous state; Experimental study; Neodymium alloys; Hard magnetic material; Magnetic refrigerators; Aluminium alloys; Magnetocaloric effects; Remanent magnetization; Coercive force; Thermodynamic properties; Application; Transition element alloys
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/S0925-8388(00)01449-3

Structure and magnetic properties of amorphous melt-spun NdFeAl and subsequently crystallized ribbons were investigated. An amorphous phase was formed after quenching by melt spinning with a copper wheel surface speed of 30 m/s. This amorphous phase exhibited hard magnetic behavior at low temperatures with a Curie temperature of 110 K and a coercivity of 1526 kA/m at 4.2 K. A hexagonal phase with the lattice parameters a=5.5111 Å and c=8.7448 Å was formed in the NdFeAl ribbon after annealing above the crystallization temperature. The magnetic entropy change was calculated directly from isothermal magnetic measurements. The results showed that the amorphous sample had a relatively high magnetocaloric effect, indicating that the amorphous alloy can be considered as a candidate for magnetic refrigeration applications.