neodymium magnets

SmCo Samarium Cobalt Ring Magnets

Samarium Cobalt (SmCo) Ring magnets are widely used in applications that have high temperature requirements, aerospace, or military.  Samarium Cobalt (SmCo) Ring Magnets can maintain their magnetic field in temperatures that exceed 250 C.
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SmCo Samarium Cobalt Ring Magnets

SmCo Ring Magnets can be custom manufactured in different ways so that they can be magnetized in a specific direction.

SmCo magnets (Samarium Cobalt) have also a very strong magnetic field. They tend to resist demagnetization extremely well. Unlike Neodymium magnets, it is also very corrosion resistant. SmCo magnets can operate at higher temperatures up to 300°C and are widely used in applications in which higher operating temperature and higher corrosion and oxidation resistance are crucial. The temperature coefficient of remanence is usually less than ±0.05%. Two common compositions of SmCo magnets are SmCo5 and Sm 2Co17. They can be sintered and bonded. Generally, the cost of SmCo magnets is higher than NdFeB magnets. But NdFeB magnets are stronger than SmCo magnets.

Samarium Cobalt (SmCo) ring magnets

Products details

Coating: none

Dimensions: Ø 18, ø 10 × 4

Form: Ring

Magnetization Direction: axial

Material: Sm2Co17

Material Grade: S240

Curie Temperature (°C): 700-800

Maximum Operating Temperature (°C): 350

Resistivity (µ 50-90

Hardness (Hv): 450-600

Density (g/cm3 ): 8.0-8.5

Relative Recoil Permeability (µrec) : 1.10

Saturation Field Strength, kOe (kA/m) : 37.5 (3000)

Temperature Coefficient of Br (%/°C): -0.05 ~ -0.03

Temperature Coefficient of iHc (%/°C) : -0.25 ~ -0.19

Direction of magnetization options

Through the Thickness:  Ring magnets where a magnetic field travels from the ID of the ring magnet to the OD of the ring magnet.

Through the Diameter:  Ring magnets where a magnetic field flows from the OD of the “north pole” to the OD of the “south pole”. The ID of the ring magnet will have a magnetic field that is straight and crosses uniformly across the ID.

Radially Magnetized:  Radially magnetized ring magnets have the magnetic poles on the OD / ID instead of the face.  Radial magnets are made as a single piece or in multiple pieces depending upon the size of the magnet.

ring magnets magnetized options


An alloy compose of SmCo5/Sm2Co17 produce by powder metallurgical method

Extremely hard & brittle

High demagnetization resistance

Excellent anti-corrosion properties

More expensive than NdFeB magnets because of limited raw material supply

Outstanding thermal stability


Rare Earth Samarium Cobalt Ring Magnets can operate in high temperature environments, or in an application where a demagnetizing force is present.  Samarium Cobalt Magnets are typically used in high temperature motors, aerospace and military applications.

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