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Rare-Earth Magnets Recovered from Hard Disks and MotorsRare-earth magnets are composite alloys, including elements from the Lanthanide group. Common alloys include neodymium-iron-boron (NdFeB) and samarium-cobalt (SmCo). Neodymium magnets are typically more powerful, while samarium magnets are well-suited to high temperature applications. -
Small and Powerful Rare-Earth MagnetsRare-earth magnets are used in numerous electronic, commercial and industrial applications including electromotors, generators, speakers, cell phones and magnetic toy building sets. - Sintered forms have more magnetic strength, but are costly, and often brittle. Bonded forms have less magnetic strength, but are less expensive and more durable.
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Rare-Earth Magnets Plated with Nickel for Corrosion ResistanceTo prevent corrosion and breakage, manufacturers usually coat rare-earth magnets with nickel or copper alloys; this gives them a shiny silver or gold appearance that differs from the flat gray or black of ferrite magnets. -
Rare-Earth Magnets in Toy Construction SetsMagnetic strength is referred to as the Maximum Energy Product and is expressed in millions Gauss Oersted (MGoe). For example, neodymium rare-earth magnets may have Maximum Energy Products of 40 to 52 MGoe, while ferrite magnets more typically exhibit Maximum Energy Products of 1 to 4 MGoe.
