I am asking this question to find out practical sizes of magnets, but this will be in a fictional setting.
Say I have a person dressed in iron armor, medieval knight-style. Are there types of magnets that weigh on the order of 500 Kgskg or so that would be strong enough to pull the armor to it? I'm not thinking of super-strength magnets like neodymium. Maybe a Kgkg of force per Kgkg of the magnet? Sorry, I'm not really familiar enough with magnets to know how to express their strength.
What material would such a magnet be made of? Would the costs of making such a magnet be overly inhibitive, or is a magnet of that size even feasible?