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Does Temperature Affect the Strength of a Magnet?

The maximum operating temperature of a magnet is an important property, but it is simply the point beyond which the magnet will experience an irreversible loss in net magnetization. In actuality, a magnet will lose net magnetization as soon as it starts to heat up. This loss is called “reversible” as it is recovered as soon as the magnet cools back down. While avoiding irreversible loss may seem to be the primary concern, even reversible loss can cause a negative impact on a magnet’s performance because while the magnet does not permanently demagnetize, it may not generate enough field for a given application at a particular operating temperature.

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