Magnet Materials

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Quick Facts

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Neodymium Iron Boron

A class of Rare Earth material, available in both sintered and bonded forms. Major characteristics: the most powerful (highest energy product) class of magnet material commercially available today. High Br, relatively high Hc, high BHmax, lower in cost than Samarium Cobalt, temperature sensitive, and susceptible to oxidation. With careful design, some grades will function up to a maximum of 210C. Energy product ranges from 1.0 MGOe to about 48 MGOe. Relative cost index: 50.

Samarium Cobalt

A class of Rare Earth material, available in both sintered and bonded forms. Major characteristics: High Br, high Hc, relatively high BHmax, higher in cost than Neodymium Iron Boron, highly resistant to oxidation. Most grades function well up to about 350 C. Energy product ranges from 18 MGOe to about 32 MGOe. Relative cost index: 100.



An alloy of aluminum, nickel, and cobalt, Alnico magnets have been popular since the 1930s. Alnico magnets are available in cast and sintered forms. Extensively used in rotating machinery, Alnico magnets exhibit high Br, but low Hc, and BHmax in the 5 MGOe range. They are the most temperature stable magnets of all the different types, and may be used with no significant losses up to about 500 C. They are relatively easily demagnetized, resisting oxidation well. Energy product ranges from 1.4 MGOe to about 7.5 MGOe. Relative cost index: 30.

Ferrite (Ceramic)

Composed of Barium or Strontium Ferrite, these materials exhibit good resistance to demagnetization, and are the lowest cost materials available today. Sintered Ferrite magnets are hard and brittle and are extensively used in consumer products. You are probably familiar with ferrite magnets, often used on the back of refrigerator magnets. Energy product ranges from 1.1 MGOe to about 4.5 MGOe. Relative cost index: 5.


Flexible magnets are manufactured by binding ferrite magnet powder in a variety of carriers, such as vinyl. The result is a magnet material that can be bent, twisted, coiled, and otherwise easily fabricated. A variety of grades are available, from 0.6 MGOe, to about 1.6 MGOe. A recent form of flexible magnet material contains Rare Earth powders, and energy products of up to 6 MGOe have been achieved. Relative cost index (for bonded ferrite): 1.

Quick Comparison Chart

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