Sm–Co magnets are prepared by sputter deposition with composition SmCox, x=5–12.3. A dependence of magnetization, coercivity, and energy product on the thickness for SmCo5 is found. The thickest samples have the largest values of each of these properties. Increasing the Co content leads to a two-phase system with hard Sm–Co and soft Co phases that are strongly exchange coupled. Large energy products are obtained (up to 17MGOe at 400K and 19MGOe at 300K). The temperature dependence of the coercivity indicates that domain walls are pinned at narrow pin sites.
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Andreescu et al. (2005) studied this question.
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