We developed a finite-element micromagnetic algorithm to study the magnetic properties of a Sm(Co,Fe,Cu,Zr)_(z) magnet. The cellular microstructure, consisting of a 2:17-type matrix and 1:5-type cell boundaries, is built according to the experimental results. Calculated results show a strong influence of microstructural parameters on the magnetic properties. The coercivity increases with an increase in the 2:17-type cell size. A thick cell boundary gives rise to small coercivity. The dependence of the coercivity on the magnetic parameters of the boundary phase is also discussed. The coercivity mechanism is analyzed by comparing the calculated results with the experimental ones.
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