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.

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
Alliance SmCo Grades	g/cm3	lbs/in3	psi	Pa x 10⁶	psi x 10⁶	Pa x 10⁹	ǁ to M	Ʇ 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