thats good to know LS! although it would be a weak magnet it should still do its job

.....and yes the way a magnet works is
basically the metal has regions on roughly aligned atoms (cause all the atoms electrons interact with one another like a floating cloud of charge) and when you put a magnet next to a metal and heat it up all the regions in the metal can move because the metal goes liquidy and the atoms have room to move, so the magnet forces all the regions to align, and when that happens all the cumulative charge of all the atoms makes you a nice magnet
so its interesting to know that the magnetic field of the earth is strong enough to do the same thing! will definately have to try this
cheers LS