Shin-Etsu Rare Earth Magnets

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Thermal coefficient of coercive force (Hcj)

The coercive force Hcj of magnets varies with the temperature. The slope when this thermal change is approximated with a straight line is called the thermal coefficient of coercive force. The unit is per cent per kelvin [%/K]. Rare earth magnets generally have a negative value for this coefficient and the smaller the absolute value, the less the change of the coercive force H_cJ with temperature. For Nd-Fe-B family magnets, this coefficient has values about from -0.40 to -0.65 [%/K] and for SmCo family magnets, this coefficient has values about from -0.17 to -0.25 [%/K].

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Glossary list