Microstructure and Its Effect on the Magnetic, Magnetocaloric and Magnetostrictive Properties of Tb55Co30Fe15 Glassy Ribbons

Abstract

In the present work, the microstructure and its effect on the magnetic, magnetocaloric, and magnetoelastic properties of the Tb55Co30Fe15 melt-spun ribbon were investigated. The ribbon exhibits typical amorphous characteristics in its X-ray diffraction examination and differential scanning calorimetry measurement. However, the magnetic properties of the ribbon indicate that the ribbon is inhomogeneous in the nanoscale, as ascertained by a high-resolution electron microscope. Compared to the Tb55Co45 amorphous alloy, the Tb55Co30Fe15 ribbon shows poor magnetocaloric properties but outstanding magnetostriction. A rather high value of reversible magnetostriction up to 788 ppm under 5 T was obtained. The mechanism for the formation of nanoparticles and its effect on the magnetocaloric and magnetostrictive properties were investigated.

Formability and Magnetic Properties of the Binary Nd-Co Amorphous Alloys

“…The high coercivity obstructed the magnetization of the samples at low temperature and thus led to another characteristic of typical spin glass behavior, that is, the decreasing magnetization under a very low magnetic field from Tf to 10 K [8,28,30]. Figure 6 The coercivity in the amorphous alloys is believed to be harmful to their magnetocaloric properties [30,31]. From the M-H curves of the Nd100−xCox MGs, we can obtain the magnetic entropy change curves of these amorphous ribbons with an error limit of less than 0.5%.…”

“…From the M-H curves of the Nd100−xCox MGs, we can obtain the magnetic entropy change curves of these amorphous ribbons with an error limit of less than 0.5%. Figure 7a The coercivity in the amorphous alloys is believed to be harmful to their magnetocaloric properties [30,31]. From the M-H curves of the Nd 100−x Co x MGs, we can obtain the magnetic entropy change curves of these amorphous ribbons with an error limit of less than 0.5%.…”