Making a Ferromagnet
An unmagnetized piece of iron is placed between two magnets, heated, and then cooled, or simply tapped when cold. The iron becomes a permanent magnet with the poles aligned as shown: its south pole is adjacent to the north pole of the original magnet, and its north pole is adjacent to the south pole of the original magnet. Note that there are attractive forces between the magnets.
Source
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"OpenStax College, College Physics. November 18, 2012."
http://cnx.org/content/m42368/latest/?collection=col11406/1.7
OpenStax CNX
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