Mechanism of the anomalous temperature dependence of coercivity in Sm(Co,Fe,Cu,Zr)z high-temperature magnets | Zendy

Chuanbing Rong | Zendy; Hong-Wei Zhang | Zendy; Bao-gen Shen | Zendy; J. Ping Liu | Zendy

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Mechanism of the anomalous temperature dependence of coercivity in Sm(Co,Fe,Cu,Zr)z high-temperature magnets

Author(s) -

Chuanbing Rong,

Hong-Wei Zhang,

Bao-gen Shen,

J. Ping Liu

Publication year - 2006

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.2167795

Subject(s) - coercivity , curie temperature , condensed matter physics , materials science , nucleation , magnetization , magnetic hysteresis , magnet , intergranular corrosion , ferromagnetism , metallurgy , thermodynamics , magnetic field , alloy , physics , quantum mechanics

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. © 2006 American Institute of Physics.

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