Samarium Cobalt Magnet Material Grades

More about Samarium Cobalt

Click on a grade below to view its demagnetization curve.

Grade	Maximum Energy Product BHmax	Residual Induction Br	Minimum Intrinsic Coercivity Hci	Coercivity Hc	Maximum Operating Temp Tmo	Curie Temp Tc	Coefficient Induction 20-150 °C α	Coefficient Coercivity 20-150 °C β
	MGOe	kG	kOe	kOe	°C	°C	% / °C	% / °C
Type 2:17
S3010	30	11.2	10	9.2	300	825	-0.03	-0.17
S2610	26	10.5	10	8.8	300	825	-0.03	-0.17
S3212	32	11.5	12	10.0	300	825	-0.03	-0.17
S3012	30	11.3	12	9.8	300	825	-0.03	-0.17
S2612	26	10.6	12	9.4	300	825	-0.03	-0.17
S2212	22	9.9	12	9.0	300	825	-0.03	-0.17
S3315	33	11.7	15	10.7	300	825	-0.03	-0.22
S3215	32	11.5	15	10.5	300	825	-0.03	-0.22
S3015	30	11.3	15	10.3	300	825	-0.03	-0.22
S2816	28	11.0	16	10.3	300	825	-0.03	-0.22
S2616	26	10.8	16	10.1	300	825	-0.03	-0.22
S3218	32	11.6	18	10.8	300	825	-0.03	-0.22
S3018	30	11.3	18	10.6	300	825	-0.03	-0.22
S2618	26	10.7	18	10.1	300	825	-0.03	-0.22
S2820	28	11.0	20	10.4	300	825	-0.03	-0.22
S2620	26	10.8	20	10.3	300	825	-0.03	-0.22
S3022	30	11.3	19	10.5	300	825	-0.03	-0.22
S2825	28	11.1	25	10.5	300	825	-0.03	-0.22
S2625	26	10.8	25	10.2	300	825	-0.03	-0.22
S2425	24	10.3	25	9.8	350	825	-0.03	-0.22
S2225	22	9.7	25	9.2	350	825	-0.03	-0.22
S2830	28	11.0	30	10.5	350	825	-0.03	-0.22
S2630	26	10.8	30	10.3	350	825	-0.03	-0.22
S2430	24	10.3	30	9.8	350	825	-0.03	-0.22
S2230	22	9.7	30	9.3	350	825	-0.03	-0.22
S2435	24	10.3	35	9.9	350	825	-0.03	-0.22
S2235	22	9.7	35	9.3	350	825	-0.03	-0.22
Type 1:5
S2415	24	10.0	15	9.3	250	750	-0.05	-0.22
S2215	22	9.5	15	8,8	250	750	-0.05	-0.22
S2418	24	10.0	18	9.4	250	750	-0.05	-0.22
S2218	22	9.5	18	9.0	250	750	-0.05	-0.22
S2018	20	9.0	18	8.5	250	750	-0.05	-0.22
S1818	18	8.6	18	8.2	250	750	-0.05	-0.22
S2220	22	9.5	20	9.1	250	750	-0.05	-0.22
S2020	20	9.0	20	8.6	250	750	-0.05	-0.22
S1820	18	8.6	20	8.2	250	750	-0.05	-0.22
S2223	22	9.5	23	9.1	250	750	-0.05	-0.22
S2025	20	9.0	25	8.6	250	750	-0.05	-0.22
S1825	18	8.6	25	8.2	250	750	-0.05	-0.22
S2030	20	9.0	30	8.6	250	750	-0.05	-0.22

 

Typical Physical Properties - Type 2:17
Curie Temperature	800 - 825°C
*Coefficient of Thermal Expansion - Perpendicular to magnetization orientation	+11.0 - +12.0 x 10-6 °C-1
*Coefficient of Thermal Expansion - Parallel to magnetization orientation	+9.0 - +10.0 x 10-6 °C-1
Electrical Resistivity	80 - 90 µΩ·cm
Density	8.3 - 8.4 g·cm-3
Vicker's Hardness	550 - 650 HV
Young's Modulus	140 - 150 kN·mm-2
Bending Strength	0.09 - 0.15 kN·mm-2
Compressive Strength	0.65 - 0.80 kN·mm-2

*Due to magnetostriction, all magnetic materials expand/contract at different rates, depending on magnetic orientation.

 

Typical Physical Properties - Type 1:5
Curie Temperature	720 - 750°C
*Coefficient of Thermal Expansion - Perpendicular to magnetization orientation	+12.0 - +13.0 x 10-6 °C-1
*Coefficient of Thermal Expansion - Parallel to magnetization orientation	+6.0 - +7.0 x 10-6 °C-1
Electrical Resistivity	50 - 60 µΩ·cm
Density	8.2 - 8.3 g·cm-3
Vicker's Hardness	550 - 650 HV
Young's Modulus	100 - 110 kN·mm-2
Bending Strength	0.12 - 0.18 kN·mm-2
Compressive Strength	0.9 - 1.0 kN·mm-2

*Due to magnetostriction, all magnetic materials expand/contract at different rates, depending on magnetic orientation.

About Samarium Cobalt

The first commercially viable rare earth permanent magnet material, Samarium Cobalt (Sm-Co), is considered to still be the premium material for many high performance applications. Formulated in the 1960s, it came as a revolutionary product, initially tripling the energy product of other materials available at the time.

Sm-Co materials come in energy products from 16 MGOe up to 33 MGOe. Their high resistance to demagnetizing influences and excellent thermal stability has ensured Sm-Co as the premium choice for the most demanding motor applications. In addition, the corrosion resistance is significantly higher than, for example, Nd-Fe-B. However, we would still recommend coating the magnet in acidic conditions. Its corrosion resistance has also offered a high degree of comfort to those looking to use magnets in medical applications.

On a 'per pound' basis, Sm-Co is the most expensive permanent magnet material. However, because of its high energy product, it has achieved considerable commercial success by decreasing the required volume of magnet material to fulfill a certain task. Sm-Co can typically be used up to 300 °C, though, of course, its actual performance at that temperature is governed strongly by the design of the magnetic circuit. The (approximately) linear demagnetization curve of Sm-Co materials allows repeatable performance over a wide range of operating conditions. As with all permanent magnet materials, extreme caution must be exercised when handling magnetized samples. Sm-Co can be prone to chipping and should not be used a structural component in an assembly.