Structure and magnetic properties of SmCoxTi0.4-1:7 ribbons |
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Authors: | Z Yao CB Jiang |
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Institution: | Department of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, People''s Republic of China |
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Abstract: | SmCoxTi0.4 (x=6.6, 7.1, 7.6, 8.1) ribbons have been prepared by melt spinning at a wheel speed of 42 m/s, followed by annealing at 750 °C for 2 h. Both as-spun and as-annealed ribbons possess the disordered TbCu7-type (1:7) phase even when the Sm/(Co,Ti) atomic ratio deviates from 1/7. The c/a ratio increases with increasing Co concentration x, but the unit cell volume decreases. The Curie temperatures show above 700 °C, increasing from 707 °C for x=6.6 to 782 °C for x=8.1. The saturation magnetizations increase almost linearly with increasing Co content. The observed magnetic hardening is believed to arise from the high magnetocrystalline anisotropy of the 1:7 phase and the fine nanograin structure. The intrinsic coercivity of 9797 Oe has been obtained in the melt-spun SmCo7.1Ti0.4 ribbons. |
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Keywords: | 75 50 Ww 75 50 Vv 75 30 Gw 75 60 Ej |
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