Abstract
Alloys of composition Nd 10.8Dy 0.75Tb 0.75Fe 79.7− x Co x Zr 0.8Nb 0.8Cu 0.4B 6.0 ( x=0, 3, 6, 9, 12, 15) were prepared by melt spinning at 22 m/s and subsequent annealing. Phase analysis revealed single-phase materials. Magnetic structure and remanence analysis indicated strong exchange coupling between neighboring grains in all samples. The remanence polarization J r and maximum energy product ( BH) max increased first and then decreased with further increasing Co content x although the intrinsic coercivity H ci decreased with increasing x. The increase in remanence polarization J r by the substitution of Co for Fe is mainly caused by the increase in the saturation polarization J s rather than by the improvement of exchange-coupling interactions. Optimum magnetic properties with J r=1.041 T, H ci=944.9 kA/m and ( BH) max=155.1 kJ/m 3 were achieved for x=12 ribbons. The mechanism of magnetic hardening in all samples was of pinning type by analyzing initial magnetization and the dependence on applied magnetizing field of the coercivity and remanence.
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