Honestly, SDAI I dont know when you are joking....

ET got it mostly right in his post below... except I would add that it depends on the type of magnet...

If you heat a magnet the alignment of spins will become disordered and the net magnetism will be lost....

completely unrelated:

A cool demo I did while teaching a physics class....

Take a straight copper tube.... get a cylindrical rare earth magnet that is fairly powerful and just the right diameter to fit in the tube. Get an identical cylinder of a non magnetic material.

Ok, I ask my class " Copper is non magnetic right?"

I drop the non magnetic cylinder into the tube and it falls out the other end in less than a second,,,,

"Since copper is not magnetic what will happen when I drop this magnet of identical size through the tube?" <as always no one answers>

I drop the magnet through the tube....after maybe 5 seconds it falls out the other end...

"Now, you can turn in your lab report next week, or you can explain- with equations and diagrams- why the magnet took so much longer and if you are reasonably close to correct I will give you a score of 100%"

THAT got their attention... 5 took me up on it and 3 got it right....

I leave the explanation as an exercise for the reader...

anyone care to explain what happened?
:)