In most magnet materials, the strength of magnetization decreases with increases in temperature, a fact which must be considered for all practical applications. If, for example, we heat a magnet to given temperature, there will be three kinds of changes in the magnet material:
| 1. |
Structural changes :
Irreversible changes of its Metallurgical Phase and/or Chemical Structure. |
| 2. |
Irreversible changes in magnetic characteristics:
The loss, which occurs if the magnet is once exposed in a high temperature even after returning back to room temperature. In this loss, however, it is recoverable by remagnetizing. |
| 3. |
Reversible changes of rare-earth magnetic performance:
Reversible losses are changed in flux which are reversible with temperature changes. But the loss will be regained spontaneously when the magnet cools back to room temperature. |
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