Magnetic Properties and Microstructure of (Fe0.5+y Pt0.5-y)zB100-z (y=0-0.2; z= 82 and 84) Melt Spun Ribbons
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 (Fe0.5+yPt0.5-y)zB100-z (y=0-0.2; z=82 and 84), multiple phases, namely γ1, Fe2B and Fe3B, with nanoscaled grain sizes (25-35 nm) can readily form in ribbons after an isothermal annealing at 500 ℃. 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 iHc of more than 12 kOe has been obtained in (Fe0.6Pt0.4)82B18 (Br=6.6 kG, (BH)max=8.9 MGOe), and a Br of 9.4 kG, iHc of 7.5 kOe and (BH)max of 14.0 MGOe can be achieved in (Fe0.675Pt0.325)84B16- Magnetically soft Fe2B and Fe3B were found to present in the matrix, as evidenced by high resolution transmission electron microscopy. Because of the higher saturation magnetization of Fe3B than Fe2B, the coexistence of Fe3B with Fe2B and γ1 phases was believed the main cause to result in the improved remanence and magnetic energy product of the (Fe0.675Pt0.325)84B16 ribbons.
permanent magnet nanocomposite melt spinning FePt FePtB ezchange-coupling
C.W.Chang H.W.Chang C.H.Chiu C.H.Chen W.C.Chang H.Ouyang C.C.Liu
Department of Physics, National Chung Cheng University, Taiwan, China Institute of Physics, Academia Sinica, Nankang, Taipei, Taiwan, China Department of Material Science and Engineering, National Chung Hsing Univ., Taichung, Taiwan, China Department of Material Science and Engineering , National Chung Hsing Univ., Taichung, Taiwan, China
国际会议
北京
英文
273-278
2006-08-29（万方平台首次上网日期，不代表论文的发表时间）