It may be what some are called, bit isotropic means 'the same in every direction'. Iron, to all intents and purposes, to a magnet field, is isotropic, the field itself and the required alignment of magnetic moment of at least some atoms in a magnetic material, is not isotrpic and never will be unless someone changes the meaning of the word isotropic and its application in science.
He says just before linking to a wiki article
http://en.wikipedia.org/wiki/Isotropic_materialho ho.
Whereas magnets, you know those field line thingies, well atoms have to line up, in a way, for that to happen, and the material is therefore not the same in one direction as in the other two. Each atom in a magnetic material is itself a magnet: it has a magnetic moment, a north pole and a south pole. The material becomes a magnet as a whole that you would recognise as a magnet, when all the magnet-atoms magnetic moments line up so (virtual) photons can go through all the atoms (or a lot of them) in a big loop.
Its a dumb use of the word, is all. Magnets cant be isotropic. Its nothing but linguitistic unresourcefulness on the part of whomever decided that one particular process to make magnets should be called this, and another that. Or they made magnets but didnt know the quantum mechanics that underlies their behaviour (which is forgivable, I'm hazy on the details, but then the detials will make your eyes bleed).
I hope this horribly laboured explanation is enough :lol: