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The magnetic field of a bar magnet is strongest at either pole of the magnet. It is equally strong at the north pole compared with the south pole. The force is weaker in the middle of the magnet and halfway between the pole and the center.
Iron, nickel, cobalt and gadolinium are the easiest to magnetize. Metals like aluminum and copper can be magnetized also, but the magnetic fields they produce are very weak. Oxides and alloys that have iron in them can also be magnetized easily, such as rust and steel.