Question

What types of magnets are easy to magnetize but lose magnetism quickly?

Answer 1

1) Via heat: ferromagnet materials will lose their magnetism if heated above a point known as the Curie temperature. ... You would have to re-magnetize the magnet again, either in a solenoid or with another permanent magnet, in order to restore the magnetism.

Answer 2

Magnets made of soft iron are very easily magnetized but quickly lose most of their magnetism when the external magnetizing force is removed. The small amount of magnetism remaining, called residual magnetism, is of great importance in such electrical applications as generator operation.