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Investigation of magnetic phase transition and magnetocaloric effect of (Ni,Co)-Mn-Al melt-spun ribbons

Magnetic phase transition, magnetocaloric effect and critical parameters of Ni50-x Cox Mn50-y Aly (x = 5 and 10; y = 17, 18 and 19) rapidly quenched ribbons have been studied. X-ray diffraction patterns exhibit a coexistence of the L 21 and 10M crystalline phases of the ribbons. Magnetization measurements show that all the samples behave as soft magnetic materials with a low coercive force less than 60 Oe. The shape of thermomagnetization curves considerably depends on Co and Al concentrations. The Curie temperature (TC ) of the alloy ribbons strongly increases with increasing the Co concentration and slightly decreases with increasing the Al concentration. The Ni45 Co5 Mn31 Al19 and Ni40 Co10 Mn33 Al17 ribbons reveal both the positive and negative magnetocaloric effects. Under magnetic field change (Δ GH) of 13.5 kOe, the maximum magnetic entropy change (|ΔS m |max ) of the Ni45 Co5 Mn31 Al19 ribbon is about 2 and -1 J·kg−1 ·K−1 for negative and positive magnetocaloric effects, respectively. Basing on Arrott - Noakes and Kouvel - Fisher methods, critical parameters of the Ni45 Co5 Mn31 Al19 ribbon were determined to be T C ≈ 290 K, β ≈ 0.58, γ ≈ 0.92 and δ ≈ 2.59. The obtained values of the critical exponents indicate that the magnetic order of the alloy ribbon is close to the mean-field model.