This thread originates from within 'usenet', and as such the content and users are not guaranteed to have been moderated by our community. Don Phillipson:[nq:1]I'm watching the Simpsons. Bart says Eat my shorts a lot and I know it's some kind of insult. But I'm just wondering what SHORT means in this sentence.
Materials that can be magnetized, which are also the ones that are strongly attracted to a magnet, are called ferromagnetic (or ferrimagnetic). These include iron, nickel, cobalt, some alloys of rare earth metals, and some naturally occurring minerals such as lodestone.
If a permanent magnet could decay at the rate given in Rook's answer above there would be none found in geological strata. A permanent magnet has a permanent orientation of the magnetic moments in a specific vectorially additive direction depending on small crystal domains.To change, i.e. be demagnetized, the magnetic moments have to be randomized by either an external magnetic field or excess heat/melting or vibrations possibly.f a permanent magnet could decay at the rate given in Rook's answer above there would be none found in geological strata. A permanent magnet has a permanent orientation of the magnetic moments in a specific vectorially additive direction depending on small crystal domains.