SmCo Permanent Magnets

Features & Characteristics

  • Samarium makes up between a quarter and a third of the elements of an SmCo magnet, depending on type and application; cobalt is the majority of the remaining content. Depending on application, SmCo magnets may also include iron, copper, and zirconium, as well as other minor additives.

  • The two major types of SmCo magnet differ according to the ratio of samarium to cobalt they contain. SmCo5 magnets have a 1:5 ratio of samarium to cobalt, while Sm2Co17 magnets have a 2:17 ratio.

    In general, Sm2Co17 magnets offer a higher maximum energy output.

    Specialized SmCo grades for temperature and corrosion resistance are available.

  • While SmCo magnets offer lower magnetic strength than NdFeB magnets, their coercivity and temperature stability are higher. They can operate at temperatures up to 300–350°C.

  • SmCo magnets have excellent thermal stability and superior corrosion resistance. They also use more widely available raw materials.

Applications

  • High-Performance Electric Motors

    SmCo magnets offer superior temperature stability for intensive motor applications.

  • Industrial Actuators

    SmCo magnets are ideal for harsh and intensive applications, enabling reliable, precise actuation.

  • Turbo Machinery

    SmCo magnets do not suffer from performance loss in corrosive, strenuous conditions, making them a good candidate for applications in heavy machinery.

  • Magnetic Bearings

    SmCo magnets offer corrosion resistance without needing additional coatings.

  • Stealth Technology

    SmCo magnets absorb radar waves to reduce radar signature, enabling aircraft stealth by minimizing detectability.

  • Missile Guidance

    High coercivity ensures stable, precise control in extreme conditions and degraded environments.

Mulberry custom-composes SmCo magnets for extreme applications.