If you heat up a magnet, you will demagnetize it. Dropping a magnet will also demagnetize it. Magnetism is created when you put a magnetic field near iron, and it rearranges all of the atoms it an organized fashion. They are not organized on a normal basis. Ceramic magnets are natural magnets, since ceramics are not something that could be magnetized artificially (except for superconductors). They are composed of Yttrium Barium Copper oxide with a silver coating to make them conduct electricity at a higher temperature. Ferrite could become magnetic when it is exposed to a magnetic field, but wouldn't get magnetized in the process. That is the reason why they are used on toroids chokes, and on the loopsticks in AM radios.