Eli5: how do magnitizers and demagnetizers work on hand tools and why isn’t it permanent ?

Question

Eli5: how do magnitizers and demagnetizers work on hand tools and why isn’t it permanent ?

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Answer 1

So with pieces of Iron and other ferromagnetic metals you get the molecules forming tiny magnets on their own. We just don’t notice because all the tiny magnets are pointed random directions and the magnetism all cancels out. If they do start lining up you get a magnet.

You can actually manipulate these molecular magnets with electric currents and magnetic fields with Magnitizers lining them up and demagnetizers scrambling them.