Samarium Cobalt ( SmCo ) Magnets - Samarium cobalt magnets (SmCo) are composed of samarium, cobalt and iron. These rare earth magnets are extremely strong for their small size, metallic in appearance and found in simple shapes such as rings, blocks and discs.

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Samarium Cobalt MAGNETS

Samarium cobalt magnets (SmCo) are composed of samarium, cobalt and iron. These rare earth magnets are extremely strong for their small size, metallic in appearance and found in simple shapes such as rings, blocks and discs.

Attributes of Samarium Cobalt

High resistance to demagnetization
High energy (magnetic strength is strong for its size)
Good temperature stability
Expensive material (cobalt is market price sensitive)

Applications of Samarium Cobalt

Computer disc drives, sensors, traveling wave tubes, linear actuators, satellite systems, motors where temporary stability is vital.

Tolerances

For as pressed material, tolerance on the thickness (direction of magnetization) is ± .005. Other dimensions are ± 2.5% or ± .010, whichever is greater.

According to IMA standards, visual imperfections such as hairline cracks, porosity and minor chips are commonly found in sintered metallic magnets. A chipped edge is considered acceptable if no more than 10% of the surface is missing. Cracks are acceptable as long as they do not extend across more than 50% of pole surface.

Samarium Cobalt Blocks

SamariumCobalt Rings

Samarium Cobalt Discs

Typical Magnetic and Physical Properties of Ceramic Magnet Material

Magnetic Materials	Density		Maximum Energy Product BH (max)	Residual Induction Br	Coercive Force Hc	Intrinsic Coercive Force Hc	Normal Maximum Operating Temp.		Curie Temp.
Magnetic Materials	lbs/in	g/cm	MGO	Gauss	Oersteds	Iersteds	F°	C°	F°	C°
SmCo 18	0.296	8.2	18.0	8700	8000	20000	482	250	1382	750
SmCo 20	0.296	8.2	20.0	9000	8500	15000	482	250	1382	750
SmCo 24	0.304	8.4	24.0	10200	9200	18000	572	300	1517	825
SmCo 26	0.304	8.4	26.0	10500	9000	11000	572	300	1517	825

Magnetizing and Handling
Samarium Cobalt magnets are very brittle and very strong magnetically. Therefore, it is crucial to handle these magnets with extreme care to avoid personal injury and damage to the magnets. Fingers can be severely pinched between attracting magnets. Magnets can chip if allowed to “jump at” an attracting object. It is highly recommended that when constructing rare earth magnetic assemblies, they be magnetized after assembly.

Samarium Cobalt Machining
Since Samarium Cobalt magnet material is prone to chipping and cracking, it does not lend itself to conventional machining methods. It can, however, be abrasively ground, but only with the use of liberal amounts of coolant. The coolant minimizes heat fracturing and the risk of fires caused by oxidized grinding dust.