Rare earth magnets were not developed until the 1970’s. Researchers were looking for materials that would constitute the primary matter in newer, stronger magnets that they could use to increase industrial output and also use in the increasing number of electronic devices demanded by the world’s population. These materials, it was hoped, would possess stronger magnetic fields and resist demagnetization better than ferrite and alnico magnets, which were the most commonly used magnetic materials up through the middle of the 20th century.
Two Kinds Of Rare Earth Magnets
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