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3d-rich alloys and their melt-spun materials with nominal compositions of Sm(CobalFexZr0.05Cu0.08GayBz)12 (x=0.1-0.41, y=0-0.01, z=0.01-0.02) were synthesized and characterized in the temperature range of 10-1473 K and at fields up to 5 T. The main phase of the as-cast alloys was formed in a Th2Ni17 type structure, exhibiting a strong uniaxial anisotropy. As a result, encouraging hard magnetic properties with Tc=995-1086 K, Ha=40-115 kOe, Ms=10-12.8 kG at 300 K, and Ha=60-180 kOe, Ms=10.4-13.6 kG at 10 K were observed in the as-cast alloys. The melt-spun materials are nano-structured in nature and magnetically hard, even in the as-spun state. The following hard magnetic properties were observed: Hci=7-10 kOe, 4πMs=9.4-11.7 kG, at 300 K, and Hci=17-27 kOe, 4πMs=9.6-12.1 kG, at 10 K. The highest (BH)max∼9.8 MGOe at 300 K was obtained from the Sm(CobalFe0.31Zr0.05Cu0.08B0.02)12 ribbon material. A Henkel plot analysis indicates the existence of a strong exchange-coupling interaction between the magnetically hard and soft phases in these ribbon materials. The effects of adding Ga, B, and Fe on the magnetic properties will be discussed.
Date of Publication: Sept. 2003