SmCo materials come in energy products from 16 MGOe up to 33 MGOe. Their high resistance to demagnetizing influences and excellent thermal stability has ensured SmCo as the premium choice for the most demanding motor applications. In addition, the corrosion resistance is significantly higher than, for example, NdFeB (Neodymium Iron Boron). However, we would still recommend coating the magnet in acidic conditions. Its corrosion resistance has also offered a high degree of comfort to those looking to use magnets in medical applications.
SmCo is the most expensive permanent magnet material On a “per pound” basis. However, because of its high energy product, it has achieved considerable commercial success by decreasing the required volume of magnet material to fulfill a certain task. SmCo can typically be used up to 300 °C, though, of course, its actual performance at that temperature is governed strongly by the design of the magnetic circuit. The (approximately) linear demagnetization curve of SmCo materials allows repeatable performance over a wide range of operating conditions. As with all permanent magnet materials, extreme caution must be exercised when handling magnetized components. SmCo can be prone to chipping and should not be used a structural component in an assembly.
Samarium Cobalt is manufactured in two compositions: Sm 1Co 5 and Sm 2Co 17 – often referred to as the SmCo 1:5 or SmCo 2:17 types. 2:17 types, with higher Hci values, offer greater inherent stability than the 1:5 types.