Development of samarium–cobalt rare earth permanent magnetic materials

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Samarium–cobalt rare‐earth (Sm–Co‐RE) permanent magnetic materials with large magnetic energy product, high coercive force, high Curie temperature, good thermal stability, and corrosion resistance, have wide potential applications in aerospace, microwave communications, instrumentation, electrical engineering, magnetic machinery, etc. In this paper, the development of Sm–Co‐RE permanent magnetic materials in the following aspects in recent years was summarized: Sm–Co‐RE permanent magnets with high application temperatures, positive temperature coefficients of coercive force, zero temperature coefficients of residual magnetization, high resistance rate, high mechanical property, and nanocrystallization.