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Why do magnets stick to refrigerators?

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Permanent magnets will attract any ferromagnetic material that is not already magnetized for repulsion. There is an interesting reason for this that surprisingly is seldom taught in science courses that include magnetism as a subject. read more

To answer that question, we need to think about what creates a magnetic field. Magnets like those on your refrigerator, which always have a magnetic field, are called permanent magnets. The secret of permanent magnets lies in the material they're made of, which usually is metal that contains a lot of iron. read more

Turns out that a refrigerator magnet is a Halbach array, which is a special arrangement of magnets that uses superposition to strengthen the magnetic field on one side of the array while cancelling the field on the other side. read more

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