Magnetoelastic and magnetocaloric properties of Tb62.5Co37.5 amorphous alloy

Magnetic and Magneto-Caloric Properties of the Amorphous Fe92−xZr8Bx Ribbons

“…With the rising concerns on environmental pollution and the higher and higher cost of energy, it is an urgent need recently to develop energy-saving and environmental-friendly materials, such as new energy storage materials, magnetocaloric materials, giant impedance materials, thermoelectric materials, and magneto-strictive materials [ 1 , 2 , 3 , 4 , 5 ]. Magnetocaloric materials are the materials that exhibit an adiabatic temperature change when they experience a magnetization or demagnetization process, which is called the magnetocaloric effect (MCE).…”

Compositional Dependence of Curie Temperature and Magnetic Entropy Change in the Amorphous Tb–Co Ribbons

“…The −Δ S m peak values of the Tb x Co 100−x glassy samples under 1, 1.5, 2, 3, 4 and 5 T are summarized in Table 1 . The −Δ S m peak values of the Tb 62.5 Co 37.5 amorphous alloy are much higher than those of the TbCo amorphous ribbons, which is most likely related to the higher magnetic moment of a Tb 62.5 Co 37.5 amorphous alloy due to its high Tb concentration and the high magnetic moment of the Tb3+ ions (~9.72 μB) [ 28 ]. Considering the potential application perspective the linear −Δ S m peak ∝ T c −2/3 relationship in Gd-based amorphous alloys [ 10 , 11 , 17 , 29 ], we constructed the −Δ S m peak - T c −2/3 plots of Tb x Co 100-x glassy ribbons obtained from the (−Δ S m )- T plots under 5 T, as shown in Figure 4 b.…”

“…Only broad humps representing the first diffuse halo and the absence of visible crystalline peaks indicate the formation of a fully amorphous phase in each ribbon. Figure 2a displays the FC M-T curves of the TbxCo100−x (x = 45, 50, 55, 60, 62.5) glassy samples measured under a field of 0.03 T. By taking the derivation of the M-T curves, we can obtain the Curie temperature of the glassy samples as follows: 170 K for Tb45Co55, 130 K for Tb50Co50, 105 K for Tb55Co45, 97 K for Tb60Co40 and 92 K for Tb62.5Co37.5 [28], as summarized in Table 1. The variation of the Curie temperature with the composition of the TbxCo100−x glassy samples, and the DyxCo100−x as well as GdxCo100−x binary metallic glasses for comparison purpose [11,23], are plotted, respectively, in Figure 2b.…”

“…However, one can find that the compositional dependence of Tc follows a linear relationship in Gd-Co binary alloys, which in contrast, is nonlinear in Tb-Co and Dy-Co binary alloys. [28] In order to reveal the mechanism for the dependence of Tc on composition in these RE-Co binary metallic glasses, it is necessary to study the interactions between atoms in these metallic glasses, including the Co-Co (direct) interaction, the RE-RE (indirect) interaction and RE-Co (indirect) interaction. If the variation of Curie temperature with the composition of the RE-Co binary glassy alloys is only induced by the RE-RE interaction, the relationship between the Curie temperature and the RE content in the RE-Co binary metallic glasses agrees well with the RKKY (Ruderman-Kittel-Kasuya-Yosida) indirect interaction model, that is, Tc will have a linear relationship with the G factor, which is a physical quantity simply related to the mole fraction of the RE element in the alloy system that contains merely one type of RE atoms [17,26].…”

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

“…Recently, we systematically investigated the GFA and magnetic properties of binary Tb-transition metal (TM) and Dy-TM alloys and obtained excellent magnetostrictive properties in these binary amorphous ribbons. For example, the Tb 62.5 Co 37.5 fully amorphous alloy exhibits a rather high magnetostriction: ~320 ppm and ~470 ppm under 2 T and 5 T, respectively, at 50 K [ 10 ]; while the Dy 50 Co 50 glassy ribbon shows a higher magnetostriction: ~320 ppm and ~600 ppm under 2 T and 5 T, respectively, at 60 K [ 11 ].…”