High-coercivity SmCo/sub x/ alloys were prepared by melt spinning. X-ray diffraction data indicate that the alloys exhibit a single phase SmCo/sub 5/ and Sm/sub 2/Co/sub 17/ 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 /spl mu/m. The high coercivity of the microcomposite alloys can be explained from the unpinning of domain walls at nucleation sites.
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Chen et al. (1996) studied this question.
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