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Samarium Cobalt Magnets

Samarium Cobalt (SmCo) magnets, of the Rare Earth class, have been available since the early 1970's. They are made from the alloys samarium and cobalt. These magnets possess very high magnetic properties and excellent thermal stability, while remaining resistant to corrosion. These characteristics make SmCo magnets ideal for applications requiring a resistance to wide-ranging temperatures and environments.

Samarium Cobalt magnets are manufactured by sintering or compression bonding. They are anisotropic and can only be magnetized in the direction of orientation. The material is easily magnetized in one direction, but is able to prevent magnetic pull in any other direction.

We can provide custom shapes and sizes of samarium cobalt magnets by working with you to create your unique specifications. Some of the different shapes include:

  • Arc
  • Bar
  • Rod
  • Disc
  • Horseshoe
  • Channel
  • Block
  • Ring
  • Sphere
  • Cylinders
  • Plugs
  • Cube

Applications of Samarium-Cobalt Magnets

Samarium-Cobalt magnets are ideal for corrosive environments with high temperatures. The following are some of the common industries and applications for Samarium-Cobalt magnets:

Common Industries That Use Samarium-Cobalt Magnets

  • Aerospace
  • Automotive
  • Food Processing
  • Marine
  • Medical
  • Military
  • Manufacturing

Common Applications for Samarium-Cobalt Magnets

  • Generators
  • Motors
  • Couplings
  • Magnetic Separators
  • Sensors
  • Transducers
  • Medical Devices
  • Cryogenic Applications

Contact us or request a quote to find out how we can help you.

The table below offers some guidelines for selecting a grade that will best suit your application.

Sintered Samarium Cobalt Magnets Grades & Properties

(Bd Hd) max
Curie Temp.
Temp. Coe
Max. Practical Operating
Temp. [˚F]
SmCo18 8000 8000 18 1382 0.022 482 1:5
SmCo20 8500 8000 20 1382 0.022 482 1:5
SmCo22 9000 8200 22 1382 0.022 482 1:5
SmCo24 9800 8500 24 1472 0.022 572 2:17
SmCo26 10000 9000 26 1472 0.022 572 2:17
SmCo26L 10500 5150 26 1472 0.022 572 2:17
SmCo28 10300 9500 28 1472 0.022 572 2:17
SmCo28H 10300 9500 28 1472 0.022 572 2:17
SmCo30H 11000 6000 30 1472 0.022 572 2:17

Br: Residual Induction
Gs: Gauss
Hc: Coercive Force
Oe: Oersted
Bd Hd: Maximum Energy Product
˚F: Degree Fahrenheit

Samarium Magnets

Samarium Magnets

Samarium Magnets

Samarium Magnets

Magnetism Direction Options

  • Square and rectangular Sintered Samarium Cobalt magnets can be magnetized with two poles ("N" & "S") thru the length, width, thickness and with multiple poles.
  • Round Sintered Samarium Cobalt magnet can be magnetized with two poles ("N" & "S") the thickness, diametrically and with multiple poles.
  • Ring Sintered Samarium Cobalt magnet can be magnetized with two poles ("N" & "S") thru the thickness, diametrically and with multi poles. Contact us for magnetism direction of irregular shapes.


Extreme caution must be taken when working with rare earth magnets. Magnets larger than a few centimeters are strong enough to cause injuries to body parts pinched between two magnets, or a magnet and a metal surface, even causing broken bones. Magnets allowed to get too close to each other can strike one another with force to chip and shatter the brittle material, and the flying chips can cause injuries.

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