Mechanism of the anomalous temperature dependence of coercivity in Sm(Co, Fe, Cu, Zr)z high temperature magnets
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Date
2006Author
Rong, Chuan-Bing
Shen, Bao-Gen
Zhang, Hong-Wei
Liu, J. Ping
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Coercivity mechanism of the precipitation-hardened Sm Co,Fe,Cu,Zr z high-temperature magnets
was found to vary with temperature by measurements of reversible magnetization. The
magnetization reversal is mainly controlled by domain-wall pinning when temperature is lower than
800 K, while is mainly dominated by nucleation at higher temperature. It is interesting to find that
the anomalous temperature dependence of coercivity Hc T near Curie temperature of the 1:5 phase
is caused by the fast drop of intergranular exchange coupling. This mechanism can also explain the
coercivity behavior that the anomalous Hc T tends to disappear with increasing z value.
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