Rare Earth Magnets

The term rare earth magnet is a general term that refers to magnets that are made from alloys of rare earth elements, typically either neodymium iron boron or samarium cobalt. Both of these rare earth alloys are manufactured by a powdered metal process, but the resulting magnets have several distinct differences.

Dura Magnetics offers industry-leading rare earth magnet design and engineering.

Neodymium is the strongest available rare earth magnet alloy at up to 55MGOe and temperatures up to 230°C/446°F.

Samarium Cobalt magnets are available in grades 16 to 35 MGOe with operating temperatures up to 350°C/662°F.

  • Neodymium iron boron rare earth magnets are highly reactive to environmental conditions, whereas samarium cobalt rare earth magnets are very corrosion resistant.
  • Samarium cobalt rare earth magnets will withstand high temperatures without demagnetizing, while care must be used when utilizing neodymium above ambient room temperatures.
  • Neodymium iron boron rare earth magnets are moderately priced and offer a good value when compared to performance. Samarium cobalt magnets are considerably more expensive due to their cobalt content.
  • Neodymium iron boron rare earth magnets are less brittle than samarium cobalt rare earth magnets and are easier to machine and integrate into magnetic assemblies. Both alloys require diamond tooling, EDM, or abrasive grinding when machining.

DFARS & ITAR Compliance

Limited availability of Defense Federal Acquisition Regulation Supplement (DFARS) compliant material can make small magnet production runs costly. However, we stock various grades at our U.S. facility, enabling us to provide cost-effective, DFARS-compliant magnets for all customers if needed, regardless of project size or requirements.