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Temperature Effects on Samarium Cobalt Magnets

Sintered Samarium Cobalt rare earth magnets are extremely resistant to demagnetization and can operate at temperatures up to 500F (260C). There are many Samarium Cobalt grades which can withstand higher temperatures, but several factors will dictate the overall performance of the Samarium Cobalt rare earth magnet. One of the most pertinent variables is the geometry of the magnet or magnetic circuit. Samarium Cobalt magnets which are relatively thin compared to their pole cross-section (Magnetic Length / Pole Area) will demagnetize easier than Samarium Cobalt magnets which are thick. Magnetic geometries utilizing backing plates, yokes, or return path structures will respond better to increased temperatures. The maximum recommended operating temperatures listed on the Samarium Cobalt magnetic characteristics page do not take into account all geometry conditions. Please contact a Dura team member for Samarium Cobalt rare earth magnet design assistance when elevated temperatures are involved in your application.

Please refer to the Available Samarium Cobalt Magnet Grades section of our website for specific thermal performance.

Technical Articles
Why Magnets Lose Strength:  The Effects of Volume Loss, Geometry, Elevated Temperature, and Demagnetization from External Fields
Effects of Heat on Rare Earth Magnets: Reversible vs. Irreversible Field Loss


Did You Know?

Neodymium magnets are the strongest magnet material available, with strengths ranging from 30MGOe to 52MGOe Energy Product.

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