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These supplies are the only ones that can retain magnetization and turn into magnets a typical instance is a conventional refrigerator magnet. Ferrimagnetic supplies, which contain ferrites and the oldest magnetic materials magnetite and lodestone, are similar to but weaker than ferromagnetism. The difference involving ferro- and ferrimagnetic supplies is associated to their microscopic structure, as explained in Magnetism. A excellent a Neodymium Magnet could have a magnetic moment of magnitude .1 A•m2 and a volume of 1 cm3, or 1×10−6 m3, and as a result an average magnetization magnitude is one hundred,000 A/m. Such a big value explains why...