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Types of Rare Earth Magnets

Neodymium and samarium cobalt are strongest types of rare earth magnets classified as permanent magnets.

Samarium Cobalt (SmCo) was the first type of rare earth magnet invented. While samarium cobalt magnets have a weaker magnetic field strength than neodymium magnets, samarium cobalt magnets have a higher Curie temperature, making them useful for applications in which high field strength is needed at high operating temperatures. Samarium cobalt rare earth magnets have a high resistance to oxidation, but can be more susceptible to chipping and cracking.

Neodymium (Nd-Fe-B) type of rare earth magnet is the strongest and most affordable. They are comprised of an alloy of neodymium, iron and boron. Neodymium magnets are well suited for use in electric motors, power tools, and other products requiring strong, compact permanent magnets. They offer the highest magnetic field strength and magnetic stability, but have a lower Curie temperature. Since they tend to be more vulnerable to oxidation than samarium cobalt magnets, protective surface treatments are often applied to these rare earth magnets.

Master Magnetics is your best source for the highest quality magnets, magnetic devices and expert application assistance for OEM, point-of-purchase, industrial and retail markets. Contact us to discuss your magnet needs.

Rare Earth assortment