Magnetic properties and large magnetocaloric effect in Gd–Ni amorphous ribbons for magnetic refrigeration applications in intermediate temperature range

Magnetocaloric Effect in Uncoated Gd55Al20Co25 Amorphous Wires

“…To clarify the predominant exchange interactions of these microwires, the Arrott plots (H/M vs. M 2 ) of the M-H curves were calculated. As shown in Figure 3a, all the slopes of M 2 -H/M curves display positive values, also confirming that the PM-FM transition of these melt-extracted amorphous microwires is SOMT [18] . In addition, the M-H loops of these microwires at 20 K were measured and shown in Figure 3b.…”

Magnetocaloric effect and critical behavior in melt-extracted Gd60Co15Al25microwires

“…To determine the nature of the magnetic phase transition in the microwires, the M-H data were converted into the M 2 versus H/M Arrott plots (Fig. 2a) [20]. Figure 2b shows the ÀDS M (T) curves of the microwires for different field changes up to 5 T. It can be observed that the magnitude of ÀDS M increased with an increase in the applied field and ÀDS M was maximum near the T C (ÀDS M max ).…”

“…4a (left hand). It is noted herein that the critical exponents (b ¼ 0.432, ) can be obtained by using magnetic equations of state [20] …”

The magnetocaloric effect and critical behavior in amorphous Gd60Co40−xMnx alloys

“…Owing to the amorphous nature, they exhibit some special advantages such as the negligible magnetic hysteresis loss, higher electrical resistivity, tunable Curie temperature T c , high corrosion resistance, and large refrigerant capacity. Zhong et al 9 In this work, the effects of Mn on magnetic and magnetocaloric properties of Gd 60 Co 40Àx Mn x alloys are investigated. To investigate the nature of the ferrimagnetic (FM) to paramagnetic (PM) phase transition, we also performed a critical exponent study using the isothermal magnetization data around T c .…”