Magnets and their associated magnetic field lines. A permanent magnet (such as a bar or disk …—© Merriam-Webster Inc.

Any material capable of attracting iron and producing a magnetic field outside itself. By the end of the 19th century, all known elements and many compounds had been tested for magnetism, and all were found to have some magnetic property. However, only three elements—iron, nickel, and cobalt—exhibit ferromagnetism. See also compass, electromagnet.

This entry comes from Encyclopædia Britannica Concise.
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