Mechanism of magnetic field annealing on increasing both coercivity and magnetization of Sm(Co0.9Cu0.1)5 ribbons. (March 2021)

• Record Type: Journal Article
• Authors: Han, Xu-Hao; Sun, Ji-Bing; Chen, Si-Yi; Wang, Shu; Jiang, Yan-Fei; Cui, Chun-Xiang
• Is Part Of: Materials today communications. Volume 26(2021)
• Publication Date: 2021-03
• Subjects: Permanent magnets -- Rare earth alloys and compounds -- Rapid-solidification -- Microstructure -- Magnetic properties; Materials science -- Periodicals; 620.11
• DOI: 10.1016/j.mtcomm.2021.102052
• Languages: English
• ISSNs: 2352-4928

Abstract

Graphical abstract: Highlights: Sm(Co, Cu)5 ribbons are composed of cellular structure. Magnetic field annealing increases both coercivity and magnetization. Enhanced field-induced anisotropy and refined microstructure. Annealing varies the Cu content in two Sm-Co phases. Proposed the microstructure evolution models. Abstract: Sm(Co0.9 Cu0.1 )5 ribbons melt-spun at 40 m/s are composed of cellular structure with 13.8 % Sm2 (Co, Cu)7 cell walls encircling the Sm(Co, Cu)5 intracellular grains, which have the magnetic properties of Hc = 9.5 kOe, Mr = 39.4 emu/g, and Ms = 44.1 emu/g. After vacuum annealing at 450 °C, the ribbons keep the original cellular structure and phase composition, Hc increases by 18.9 %, and the magnetization changes little. In contrast, magnetic field annealing (MFA) increases Hc, Mr, and Ms by 64.2 %, 11.4 %, and 15.0 %, respectively. The mechanism of MFA on increasing both coercivity and magnetization of the ribbons can be attributed to the enhanced field-induced anisotropy, the refined cellular structure, the uniform distribution of the lower Cu content at 3g and 2c sites of Sm(Co, Cu)5 phase, and the higher Cu content in the cell walls. Besides, the microstructure evolution models of the different types of ribbons are proposed.