Maximum Working Temperature of Magnets
This is the maximum temperature to which the magnet may be exposed with no significant long range instability and structural changes. It is valid for magnets with sufficient large ratios of h:D and free from happening of demagnetization because of dimension change. On bonded magnet, it is also dependent on the working temperature of binder.
In the range of working temperature, the remanence and coercive field strength will back to its original value when the temperature returns to departure point. In case of out of this working temperature range, rapid reduction of magnetic strength can occur and new temperature coefficient has to be reckoned with. There are several factors determine the working temperature of individual magnet: ratio of dimension h:D and mechanical or chemical strain.
