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The microstructure and magnetic domain-wall motion of a sintered Sm(Co,Fe,Cu,Zr)z permanent magnet with different Cu and Fe contents was investigated by Lorentz transmission electron microscopy. The domain-wall motion under different magnetic fields indicates that most domain walls are strongly attracted by the SmCo5 boundary phases, but some of them are repulsed to the Sm2Co17 cell phase. Differences...
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