RARE EARTH MAGNETS

There are two types of rare earth magnets available:

They are called rare earth because their composition elements found in the "Rare Earth" or Lanthanides portion of the Periodic Table of Elements. Neodymium magnets (Nd-Fe-B) are composed of neodymium, iron, boron and a few transition metals. 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.


Typical Magnetic and Physical Properties of Neodymium Magnet Material
Magnetic Material	Density		Max. Energy Product BH (max)	Residual Induction BR	Coercive Force HC	Intrinsic Coercive Force HC	Normal Maximum Operating Temp.		Curie Temp.
Magnetic Material	lbs/in	g/cm	MGO	Gauss	Oersteds	Oersteds	Fº	Cº	Fº	Cº
Neodymium 27SH	0.267	7.4	27.0	10800	9800	20000	302	150	572	300
Neodymium 30H	0.267	7.4	30.0	11000	10500	17000	212	100	572	300
Neodymium 35	0.267	7.4	35.0	12300	10500	12000	212	100	536	280
Neodymium 40	0.267	7.4	40.0	12900	10500	12000	212	100	536	280
Neodymium 42	0.267	7.4	42.0	13000	9500	11140	212	100	536	280
Neodymium 45	0.267	7.4	45.0	13500	11000	12000	212	100	536	280
Since many combinations of elements and orientations are possible, additional grades are available.


Typical Magnetic and Physical Properties of Samarium Cobalt Magnet Material
Magnetic Material	Density		Max. Energy Product BH (max)	Residual Induction BR	Coercive Force HC	Intrinsic Coercive Force HC	Normal Maximum Operating Temp.		Curie Temp.
Magnetic Material	lbs/in	g/cm	MGO	Gauss	Oersteds	Oersteds	Fº	Cº	Fº	Cº
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