Magnetic Properties of Samarium Cobalt Magnets

The grade of Samarium Cobalt magnet is typically specified by alloy composition + number + letter. Samarium Cobalt magnets can be classified into SmCo₅(RECo₅) series and Sm₂Co₁₇ (RE₂Co₁₇) series according to alloy composition. The number that follows represent the maximum energy product (BH)max of the magnet in CGS unit “Mega-Gauss Oersted” (MGOe). There is no or one letter tagged on the end determine the intrinsic coercivity of the Samarium Cobalt magnets. Intrinsic coercivity of L, M, default, H grade should be greater than or equal to 8, 12, 18, 25 kOe, respectively. The letters LTC are the acronym for low temperature coefficient. Low temperature coefficient Samarium Cobalt magnets, which also known as temperature compensated Samarium Cobalt magnets, are possess less variation in magnetic output with temperature change by introducing heavy rare earth elements Gadolinium (Gd) and Erbium (Er).

Material	Grade	Remanence Br		Coercivity Hcb		Intrinsic Coercivity Hcj		Max. Energy Product (BH)max		Curie Temp. Tc	Max. Ope. Tem. Tw	Temp. Coeff. of Br	Temp. Coeff. of Hcj
Material	Grade	T	kGs	kA/m	kOe	kA/m	kOe	kJ/m³	MGOe	℃	℃	%/℃	%/℃
SmCo₅	RECo₅-16S	0.79-0.84	7.9-8.4	620-660	7.8-8.3	≥1830	≥23.0	118-135	15-17	750	250	-0.035	-0.28
	RECo₅–18S	0.84-0.89	8.4-8.9	660-700	8.3-8.8	≥1830	≥23.0	135-151	17-19	750	250	-0.040	-0.28
	RECo₅–20S	0.89-0.93	8.9-9.3	684-732	8.6-9.2	≥1830	≥23.0	150-167	19-21	750	250	-0.045	-0.28
	RECo₅–22S	0.92-0.96	9.2-9.6	710-756	8.9-9.5	≥1830	≥23.0	167-183	21-23	750	250	-0.045	-0.28
	RECo₅–24S	0.96-1.00	9.6-10.0	740-788	9.3-9.9	≥1830	≥23.0	183-199	23-25	750	250	-0.045	-0.28
	LTC(RECo₅-10)	0.62-0.66	6.2-6.6	485-517	6.1-6.5	≥1830	≥23.0	75-88	9.5-11.0	750	300	20-100℃: +0.0156 100-200℃: +0.0087 200-300℃: +0.0007	–
Sm₂Co₁₇	RE₂Co₁₇-24H	0.95-1.02	9.5-10.2	692-764	8.7-9.6	≥1990	≥25.0	175-191	22-24	800	350	-0.025	-0.20
	RE₂Co₁₇-26H	1.02-1.05	10.2-10.5	740-788	9.4-10.0	≥1990	≥25.0	191-207	24-26	800	350	-0.030	-0.20
	RE₂Co₁₇-28H	1.03-1.08	10.3-10.8	756-812	9.5-10.2	≥1990	≥25.0	207-220	26-28	800	350	-0.035	-0.20
	RE₂Co₁₇-30H	1.08-1.10	10.8-11.0	788-835	9.9-10.5	≥1990	≥25.0	220-240	28-30	800	350	-0.035	-0.20
	RE₂Co₁₇-32H	1.10-1.13	11.0-11.3	812-860	10.2-10.8	≥1990	≥25.0	230-255	29-32	800	350	-0.035	-0.20
	RE₂Co₁₇-22	0.93-0.97	9.3-9.7	676-740	8.5-9.3	≥1433	≥18.0	160-183	20-23	800	300	-0.020	-0.20
	RE₂Co₁₇-24	0.95-1.02	9.5-10.2	692-764	8.7-9.6	≥1433	≥18.0	175-191	22-24	800	300	-0.025	-0.20
	RE₂Co₁₇-26	1.02-1.05	10.2-10.5	748-796	9.4-10.0	≥1433	≥18.0	191-207	24-26	800	300	-0.030	-0.20
	RE₂Co₁₇-28	1.03-1.08	10.3-10.8	756-812	9.5-10.2	≥1433	≥18.0	207-220	26-28	800	300	-0.035	-0.20
	RE₂Co₁₇-30	1.08-1.10	10.8-11.0	788-835	9.9-10.5	≥1433	≥18.0	220-240	28-30	800	300	-0.035	-0.20
	RE₂Co₁₇-32	1.10-1.13	11.0-11.3	812-860	10.2-10.8	≥1433	≥18.0	230-255	29-32	800	300	-0.035	-0.20
	RE₂Co₁₇-26M	1.02-1.05	10.2-10.5	676-780	8.5-9.8	955-1433	12-18	191-207	24-26	800	300	-0.035	-0.20
	RE₂Co₁₇-28M	1.03-1.08	10.3-10.8	676-796	8.5-10.0	955-1433	12-18	207-220	26-28	800	300	-0.035	-0.20
	RE₂Co₁₇-30M	1.08-1.10	10.8-11.0	676-835	8.5-10.5	955-1433	12-18	220-240	28-30	800	300	-0.035	-0.20
	RE₂Co₁₇-32M	1.10-1.13	11.0-11.3	676-852	8.5-10.7	955-1433	12-18	230-255	29-32	800	300	-0.035	-0.20
	RE₂Co₁₇-24L	0.95-1.02	9.5-10.2	541-716	6.8-9.0	636-955	8-12	175-191	22-24	800	250	-0.025	-0.20
	RE₂Co₁₇-26L	1.02-1.05	10.2-10.5	541-748	6.8-9.4	636-955	8-12	191-207	24-26	800	250	-0.035	-0.20
	RE₂Co₁₇-28L	1.03-1.08	10.3-10.8	541-764	6.8-9.6	636-955	8-12	207-220	26-28	800	250	-0.035	-0.20
	RE₂Co₁₇-30L	1.08-1.15	10.8-11.5	541-796	6.8-10.0	636-955	8-12	220-240	28-30	800	250	-0.035	-0.20
	RE₂Co₁₇-32L	1.10-1.15	11.0-11.5	541-812	6.9-10.2	636-955	8-12	230-255	29-32	800	250	-0.035	-0.20
	LTC(RE₂Co₁₇-16)	0.81-0.85	8.1-8.5	605-669	7.6-8.4	≥1592	≥20	117-127	14-16	840	300	-50-20℃: +0.005 20-100℃: -0.008 100-200℃: -0.008 200-300℃: -0.011	–
	LTC(RE₂Co₁₇-18)	0.85-0.90	8.5-9.0	629-708	7.9-8.9	≥1592	≥20	127-143	16-18	840	300
	LTC(RE₂Co₁₇-20)	0.90-0.94	9.0-9.4	661-732	8.3-9.2	≥1592	≥20	143-159	18-20	840	300
	LTC(RE₂Co₁₇-22)	0.94-0.97	9.4-9.7	685-740	8.6-9.3	≥1592	≥20	159-175	20-22	840	300
The above-mentioned data of magnetic properties are given at room temperature. The max working temperature of magnet is changeable due to length-diameter ratio, coating thickness and other environment factors.