Abstract
Melt-spun ribbons of Er0.135Fe0.813B0.052 have a relatively large coercivity of nearly 5 kOe. The coercivity is a sharply peaked function of wheel speed (quench rate) with the optimally quenched ribbons having a wheel speed of 14 m/s and a Br of 4 kG. This also coincides with the maximum in energy product of 2.9 MGOe. The abrupt degradation of coercivity with increasing quench rate corresponds precisely to the lack of crystallinity of the ribbons as determined by x-ray powder diffraction.
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