Unmagnetized to Magnetized Iron
(a) An unmagnetized piece of iron (or other ferromagnetic material) has randomly oriented domains. (b) When magnetized by an external field, the domains show greater alignment, and some grow at the expense of others. Individual atoms are aligned within domains; each atom acts like a tiny bar magnet.
Source
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"OpenStax College, Ferromagnets and Electromagnets. November 18, 2012."
http://cnx.org/content/m42368/latest/Figure_23_02_02a.jpg
OpenStax CNX
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