Both series of samarium cobalt magnets are highly resistant to corrosion, and they are employed in harsh environments. Samarium cobalt magnets only have a fraction of iron and some rare earth elements, which are not prone to oxidation and corrosion. Yet, neodymium magnets have 60-70% of iron. Therefore, it is common to use uncoated samarium cobalt magnets, while extra coatings are needed for neodymium magnets.
–Demagnetization Resistance
In addition to their high magnetic strength and temperature stability, samarium cobalt magnets also have a relatively high coercivity, which means that they are more difficult to demagnetize than other types of magnets. This makes them ideal for use in applications where high magnetic stability is required, such as in sensors and magnetic bearings.