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 Magnetic and Magnetocaloric Behaviors in Gd50Al25Co25/FeNi Core/Shell Structured Microwires
Tác giả hoặc Nhóm tác giả: N.T.M. Duc, H.X. Shen, S. Jiang, N.T. Huong, J.F. Sun, and M.H. Phan
Nơi đăng: The 5th International Conference of Asian Union of Magnetics Societies (ORAL) (IcAUMS 2018), June 3-7, 2018, Jeju, Korea; Số: G6-0966;Từ->đến trang: G6-0966;Năm: 2018
Lĩnh vực: Khoa học công nghệ; Loại: Báo cáo; Thể loại: Quốc tế
TÓM TẮT
ABSTRACT
A novel core/shell structure consisting of melt-extracted Gd50Al25Co25 microwire coated with FeNiby electrodeposition has been fabricated, and its magnetic and magnetocaloric properties have been studied systematically. Scanning electron microscopy revealed that the surface of the Gd50Al25Co25 microwireof ~50 μm diameter was uniformly covered by a ~3 μm thick layer of FeNi. Magnetization measurements indicate that as compared to the Gd50Al25Co25 microwire, the Gd50Al25Co25/FeNi core/shellmicrowire exhibits a broader paramagnetic to ferromagnetic phase transition whilepossessinga similar Curie temperature of ~95 K. The effect of the FeNi layer on the magnetization of the Gd50Al25Co25 microwire is more significant in the ferromagnetic regime than in the paramagnetic regime. Due to the different orientation of magnetization of the FeNi shell with respect to that of the Gd50Al25Co25 core, it is harder to align the magnetic momentsin case of the Gd50Al25Co25/FeNi core/shell
microwire subject to the same applied magnetic field.The saturation magnetization of the FeNi shell is also found to be relatively smaller than that of the Gd50Al25Co25 core. As a result, the magnetic entropy change (ΔSM) determined from isothermal magnetization measurements using Maxwell relationship decreasesfrom ~10 J/kg Kfor the Gd50Al25Co25 microwire to ~6 J/kg Kfor the Gd50Al25Co25/FeNi core/shellmicrowire, for a field change of 5 T.Our study highlights the significant effect of a magnetic coating layer on the magnetocaloric response of the Gd alloy microwireand shows the new possibility of enhancing this magnetocaloric figure-of-merit in a structured core/shell microwire whose shell possesses higher saturation magnetization compared to the core’s magnetization. G6-
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