Shin-Etsu Rare Earth Magnets

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Coefficient of thermal expansion

The degree to which the size of an object changes with temperature. There are the coefficient of volumetric expansion for the change in the volume and the coefficient of linear expansion for the change in length. The unit is per kelvin [1/K]. For strongly magnetic bodies with crystalline magnetic anisotropy, the coefficient of linear expansion may vary with the crystal direction. Neodymium magnets have different coefficients of thermal expansion in the magnetized direction and the non-magnetized direction. In particular, heating produces contraction along the non-magnetized direction. When pasting together an iron yoke etc. with neodymium magnets, it is necessary to pay attention to the difference in the degree of thermal expansion for change in temperature.

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Glossary list