Samarium Cobalt Magnets


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Samarium Cobalt Magnets were developed for US Air Force by the University of Dayton Research Institute (UDRI) in the 1970s. They are also called Samarium or SMCO Magnets.  They are composed of Sm, Co, balance Cu, Zi, and Fe. The powders are pressed, sintered, machined, and magnetized. They can be only made in simple shapes. To prevent chipping, customers are advised to tumble them which rounds their edges to the 0.005-inch radius. Untumbled magnets can chip and create “dirty” magnets. They are expensive, so mainly used in applications that demand exemplary performance at high temperatures.  Their energy product ranges from 15 to 32 MGOe. Their residual flux density ranges from 0.9 to 1.2 T. It is the preferred choice for operation above 150oC, up to 550 oC.

PMAG Database Folder BM lists 694 B(H) Demagnetization Curves of their 159 grades, produced by 23 manufacturers worldwide.  For names of all these grades, please click on ‘Magnets List’ on the home page.

Please review the ‘Magnets Handbook’ (on the home page) for more technical information on these materials. Version 2 contains several less-known facts on the demagnetization of magnets. They will help you to better utilize these magnets in your machine.  

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