Rare earth magnets

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A general name for highly magnetic films made from rare earth elements. The strength of rare earth magnets exceeds those of ferrite magnets by approximately 10-fold. Additionally, they are lightweight, as thin as 0.06 inches, and are resistant to corrosion and demagnetization. Rare earth magnets are divided into two categories, that is, the SmCo-type (samarium-cobalt) rare earth magnets and the NdFeB-type (neodymium-iron-boron) magnets (also called Nd magnets). More than 98% of the rare earth magnets are the Nd magnets


  • Rare earth magnets are extremely strong. Handle with caution as they can fly together and pinch fingers and art (AIC Wiki).
  • Rare earth magnets are brittle and subject to corrosion so they are usually plated or coated.

Resources and Citations

  • Gwen Spicer, 'Magnetic Mounting Systems for Museums and Cultural Institutions, Spicer Art Books, Delaware, USA (2019) Link
  • T. Minowa, 'Rare earth magnets: Conservation of energy and the environment', Resource Geology, Nov. 2008 at Wiley Online
  • Wikipedia: Website (Accessed 11/2020)
  • Product Information: available from McMaster Carr in U.S.
  • DISTLIST 18:27 Dec. 16 2004 from Neill McManus

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