Radiation damage in permanent magnets for ID

Sintered Nd 2 Fe 14 B permanent magnets are damaged (demagnetized) by strong radiation, though some techniques of the magnets can reduce the sensitivity to radiation. High coercivity magnets show strong resistance to radiation, while they have a manufacturing dependence. Using magnets at very low temperature is effective. Stabilization under the appropriate annealing conditions enhances the radiation resistance successfully. Stabilizing by reverse field also increases the resistance. Combination of these techniques is much more effective, for example, annealed high coercivity magnets indicate very strong resistance.