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Samarium Cobalt Magnets

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Samarium Cobalt Magnets, developed in the 1960’s are still commonly used today because of their excellent characteristics at very high temperatures. SmCo5 and Sm2Co17 are the two main compositions of this material. They are slightly less powerful than NdFeB magnets, however they are extremely resistant to demagnetization and have the lowest reversible temperature coefficients of all magnets. Because of the high Cobalt content, they are costly and their prices tend to be volatile. Plating is typically not required for corrosion protection, however in certain applications they are plated to limit chipping. Most common usage for these materials is in the aerospace and medical industries.

SmCo Magnet Materials

Alliance SmCo Grades Remanent
Induction
Coercive
Force
Intrinsic
Coercive Force
Maximum
Energy Product
Reversible
Temperature Coefficients
Continuous
Working Temp.
Br (Gauss) Hc
(Oe)
Hci
(Oe)
(BH)max
(MGOe)
α
Br
ß
Hci
Tw
(°C)
Min Max Min Max Min Max Min Max %/°C %/°C Max
S-18 8,000 9,000 7,800 8,800 25,000 35,000 16.0 20.0 -0.05 -0.04 250
S-20 9,000 9,500 8,500 9,300 18,000 25,000 19.0 21.0 -0.05 -0.04 250
S-22 9,500 10,000 9,000 9,500 15,000 23,000 21.0 23.0 -0.05 -0.04 250
S-18T 8,500 9,500 8,000 9,000 20,000 30,000 16.0 20.0 -0.01 -0.04 350
S-22T 9,500 10,000 8,500 9,500 20,000 30,000 20.0 24.0 -0.01 -0.04 350
S-22L 9,500 10,000 6,000 8,000 6,200 9,000 20.0 24.0 -0.03 -0.04 250
S-22H 9,500 10,000 7,000 9,500 8,000 15,000 20.0 24.0 -0.03 -0.04 250
S-22U 9,500 10,000 9,000 10,000 25,000 35,000 20.0 24.0 -0.03 -0.04 300
S-26L 10,000 10,800 6,000 8,000 6,200 9,000 24.0 28.0 -0.03 -0.04 250
S-26H 10,000 10,800 7,000 10,500 8,000 15,000 24.0 28.0 -0.03 -0.04 250
S-26U 10,000 10,800 9,500 10,500 25,000 35,000 24.0 28.0 -0.03 -0.04 300
S-28L 10,400 11,000 6,000 8,000 6,200 9,000 26.0 30.0 -0.03 -0.04 250
S-28H 10,400 11,000 7,000 10,500 8,000 15,000 26.0 30.0 -0.03 -0.04 250
S-28U 10,400 11,000 9,500 10,500 25,000 35,000 26.0 30.0 -0.03 -0.04 300
S-30L 10,800 11,200 6,000 8,000 6,200 9,000 28.0 31.0 -0.03 -0.04 250
S-30H 10,800 11,200 7,000 10,500 8,000 15,000 28.0 31.0 -0.03 -0.04 250
S-30U 10,800 11,200 10,000 10,800 25,000 35,000 28.0 31.0 -0.03 -0.04 300
S-32 11,000 11,600 7,000 10,500 8,000 15,000 30.0 33.0 -0.03 -0.04 250
S-33 11,300 12,100 8,500 11,500 10,000 22,000 29.0 34.0 -0.04 -0.25 250
Alliance SmCo Grades Density Tensile
Strength
Modulus
of Elasticity
Thermal
Expansion Coefficient /°C
Electrical Resistivity Curie Temperature
g/cm3 lbs/in3 psi Pa
x 106
psi
x 106
Pa
x 109
ǁ
to M

to M
Ω-cm x10-6@ 20 C °C 
S-18 8.4 0.303 6,000 41 23 159 6.0x10-6 1.3x10-5 53.0 750
S-20 8.4 0.303 6,000 41 23 159 6.0x10-6 1.3x10-5 53.0 750
S-22 8.4 0.303 6,000 41 23 159 6.0x10-6 1.3x10-5 53.0 750
S-18T 8.4 0.303 6,000 41 23 159 6.0x10-6 1.3x10-5 53.0 750
S-22T 8.4 0.303 5,000 35 17 117 8.0x10-6 1.1x10-5 86.0 750
S-22L 8.4 0.303 5,000 35 17 117 8.0x10-6 1.1x10-5 86.0 825
S-22H 8.4 0.303 5,000 35 17 117 8.0x10-6 1.1x10-5 86.0 825
S-22U 8.4 0.303 5,000 35 17 117 8.0x10-6 1.1x10-5 86.0 825
S-26L 8.4 0.303 5,000 35 17 117 8.0x10-6 1.1x10-5 86.0 825
S-26H 8.4 0.303 5,000 35 17 117 8.0x10-6 1.1x10-5 86.0 825
S-26U 8.4 0.303 5,000 35 17 117 8.0x10-6 1.1x10-5 86.0 825
S-28L 8.4 0.303 5,000 35 17 117 8.0x10-6 1.1x10-5 86.0 825
S-28H 8.4 0.303 5,000 35 17 117 8.0x10-6 1.1x10-5 86.0 825
S-28U 8.4 0.303 5,000 35 17 117 8.0x10-6 1.1x10-5 86.0 825
S-30L 8.4 0.303 5,000 35 17 117 8.0x10-6 1.1x10-5 86.0 825
S-30H 8.4 0.303 5,000 35 17 117 8.0x10-6 1.1x10-5 86.0 825
S-30U 8.4 0.303 5,000 35 17 117 8.0x10-6 1.1x10-5 86.0 825
S-32 8.4 0.303 5,000 35 17 117 8.0x10-6 1.1x10-5 86.0 825
S-33 8.4 0.303 5,000 35 17 117 8.0x10-6 1.1x10-5 86.0 825

SmCo Magnets Grade Comparison

SmCo Magnets Curve Comparisons

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