Editing Magnet (section)

=== Magnetization ===
{{Main|Magnetization}}

The magnetization of a magnetized material is the local value of its magnetic moment per unit volume, usually denoted '''M''', with units [[ampere|A]]/[[meter|m]].<ref>{{cite web|url=http://www.magneticmicrosphere.com/resources/Units_for_Magnetic_Properties.pdf|archive-url=https://web.archive.org/web/20110714020750/http://www.magneticmicrosphere.com/resources/Units_for_Magnetic_Properties.pdf|archive-date=2011-07-14|title=Units for Magnetic Properties|publisher=Lake Shore Cryotronics, Inc.|access-date=2012-11-05}}</ref> It is a [[vector field]], rather than just a vector (like the magnetic moment), because different areas in a magnet can be magnetized with different directions and strengths (for example, because of domains, see below). A good bar magnet may have a magnetic moment of magnitude 0.1&nbsp;A·m<sup>2</sup> and a volume of 1&nbsp;cm<sup>3</sup>, or 1×10<sup>−6</sup>&nbsp;m<sup>3</sup>, and therefore an average magnetization magnitude is 100,000&nbsp;A/m. Iron can have a magnetization of around a million amperes per meter. Such a large value explains why iron magnets are so effective at producing magnetic fields.