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Controllable spin-glass behavior and large magnetocaloric effect in Gd-Ni-Al bulk metallic glasses

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3 Author(s)
Yuan, Fang ; Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China ; Du, Juan ; Shen, Baolong

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Glass-forming ability, spin-glass (SG) behavior, and magnetocaloric effect in Gd55NixAl45-x (x = 15, 20, 25, 30) metallic alloys were investigated. A ferromagnetic SG behavior was observed for glassy ribbons with compositions of x = 15, 20, and 25, but it disappeared for that of x = 30. Furthermore, the maximum magnetic entropy change (-ΔSmmax) increased with the increasing Ni/Al-ratio while the decrease of full width at half -ΔSmmax was almost negligible. Accordingly, -ΔSmmax of 9.25 J kg-1 K-1, adiabatic temperature change of 4.3 K and refrigeration capacity of 851 J kg-1 under 50 kOe were obtained for Gd55Ni30Al15 glassy alloy.

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Applied Physics Letters  (Volume:101 ,  Issue: 3 )