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Absfracr-High-coercivity SmCo, alloys were prepared by melt spinning. X-ray diffraction data indicate that the alloys exhibit a single phase S m C s and SmzCol, structure at x = 5.0 and x = 8.5, respectively. A two-phase structure appears at 5.0 < x < 8.5. The coercivity of the studied alloys increases as the wheel speed is increased up to a maximum value of 40 m/s. The grain sizes of the as-spun alloys were measured to be 0.1-1.0 pm. The high coercivity of the microcomposite alloys can be explained from the unpinning of domain walls at nucleation sites.

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