Portal de Periódicos da CAPES

Effect of rapid quenching speeds on phase structure and magnetic properties of melt-spun Sm(Co,Fe,Cu,Zr)7.5 ribbons

2008; Elsevier BV; Volume: 476; Issue: 1-2 Linguagem: Inglês

10.1016/j.jallcom.2008.09.052

1873-4669

Ji-Bing Sun, Z.X. Zhang, Chunxiang Cui, Wei Yang, Pan Guo, Dong Han, B.L. Wang,

Magnetic properties of thin films

Sm(Co0.68Cu0.07Fe0.22Zr0.03)7.5 nanocrystalline melt-spun ribbons are prepared at different speeds. The results show that the ribbons consist of Sm(Co,M)7(M = Cu, Fe, Zr) main phase and a little α-Fe phase. And the ribbons are composed of three areas: equiaxed area, columnar area, and dendritic crystal area. Preferred orientation exists in both the columnar area and the dendritic crystal area. Following the increase of the melt-spun speed, the orientation degree of melt-spun ribbons increases first, then descends, and reaches the maximum ratio I(0 0 2)/I(1 1 1) of 3.81 when the speed is 20 m/s. Preferred orientation in the ribbons helps to improve the magnetic properties of ribbons. The best comprehensive magnetic properties of the ribbons melt-spun at 20 m/s are Mr = 39.27 emu/g, Ms = 75.79 emu/g, Hci = 1301.9 Oe, and Mr/Ms = 0.52.