Abstract
The Fe-B/FePt-type nanocomposite ribbons with strong exchange-coupling and high permanent magnetic properties have been developed by the melt-spinning method. For ternary (Fe 0.5+yPt 0.5-y) zB 100-z (y=0–0.2; z=82 and 84), multiple phases, namely γ 1, Fe 2B and Fe 3B, with nanoscaled grain sizes (25–35 nm) can readily form in ribbons after an isothermal annealing at 500 °C. Strong exchange-coupling between grains was found in these ribbons, giving rise to an enhancement of not only the remanence but also the maximum energy product. An iH c of more than 12 kOe has been obtained in (Fe 0.6Pt 0.4) 82B 18 (B r= 6.6 kG, (BH) max=8.9 MGOe), and a B r of 9.4 kG, ft of 7.5 kOe and (BH) max of 14.0 MGOe can be achieved in (Fe 0.675Pt 0.325) 84B 16. Magnetically soft Fe 2B and Fe 3B were found to present in the matrix, as evidenced by high resolution transmission electron microscopy. Because of the higher saturation magnetization of Fe 3B than Fe 2B, the coexistence of Fe 3B with Fe 2B and γ 1 phases was believed the main cause to result in the improved remanence and magnetic energy product of the (Fe 0.675Pt 0.325) 84B 16 ribbons.
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