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SmCo Magnets

SmCo magnets are mostly manufactured by powder metallurgical process (smelting-milling-pressing-sintering), they are also called sintered SmCo magnets. With years of experience and state of the art technologies, high grade 34 (energy product up to 32-34 MGOe), low reversible temperature coefficient (RTC of Br better than -0.02%/°C) and ultra high temperature SmCo magnets have been developed. SmCo magnets are especially suitable for high performance applications including high speed motors, circulators, isolators, traveling wave tubes, gyroscopes, accelerometers and magnetic sensors. SmCo magnets usually do not need any coating because of high corrosion resistance. Besides, they can be plated with nickel, epoxy or other coating as per custom requirements.

custom magnet samarium cobalt smco arc magnet segment magnet
SmCo arc magnet
samarium cobalt smco rare earth magnet disc magnet cylinder magnet
SmCo cylinder magnet
custom magnet ring smco magnet with epoxy coating
epoxy coated SmCo ring magnet
samarium cobalt smco rare earth magnet ring magnet
SmCo ring magnet
samarium cobalt smco block magnet
SmCo block magnet
custom magnet disc smco magnet with nickel coating
nickel plated SmCo disc magnet

SmCo Magnets’ Grades, Magnetic Properties

Magnet
Grade[1][2]		 Max. Energy Product
(BH)max		 Residual Induction
Br		 Coercive Force
Hcb		 Intrinsic Coercivity
Hcj		 RTC of Br
α(Br)[3]		 Max. Operating
Temp.[4]
MGOe kJ/m3 kGs T kOe kA/m kOe kA/m %/°C °C °F
Regular Sm2Co17   Magnets / Samarium Cobalt 2:17
XGS34H 32-34 255-271 11.5-11.9 1.15-1.19 ≥10.5 ≥836 ≥25 ≥1990 -0.035 350 662
XGS34 32-34 255-271 11.5-11.9 1.15-1.19 ≥10.3 ≥820 ≥18 ≥1433 -0.035 300 572
XGS34M 32-34 255-271 11.5-11.9 1.15-1.19 ≥9.2 ≥732 ≥12 ≥955 -0.035 300 572
XGS34L 32-34 255-271 11.5-11.9 1.15-1.19 ≥7.0 ≥557 ≥8 ≥636 -0.035 250 482
XGS32H 30-32 239-255 11.1-11.5 1.11-1.15 ≥10.2 ≥812 ≥25 ≥1990 -0.035 350 662
XGS32 30-32 239-255 11.1-11.5 1.11-1.15 ≥10.0 ≥796 ≥18 ≥1433 -0.035 300 572
XGS32M 30-32 239-255 11.1-11.5 1.11-1.15 ≥9.0 ≥716 ≥12 ≥955 -0.035 300 572
XGS32L 30-32 239-255 11.1-11.5 1.11-1.15 ≥6.8 ≥541 ≥8 ≥636 -0.035 250 482
XGS30H 28-30 223-239 10.8-11.1 1.08-1.11 ≥9.9 ≥788 ≥25 ≥1990 -0.035 350 662
XGS30 28-30 223-239 10.8-11.1 1.08-1.11 ≥9.7 ≥772 ≥18 ≥1433 -0.035 300 572
XGS30M 28-30 223-239 10.8-11.1 1.08-1.11 ≥8.7 ≥692 ≥12 ≥955 -0.035 300 572
XGS30L 28-30 223-239 10.8-11.1 1.08-1.11 ≥6.8 ≥541 ≥8 ≥636 -0.035 250 482
XGS28H 26-28 207-223 10.4-10.8 1.04-1.08 ≥9.6 ≥764 ≥25 ≥1990 -0.035 350 662
XGS28 26-28 207-223 10.4-10.8 1.04-1.08 ≥9.4 ≥748 ≥18 ≥1433 -0.035 300 572
XGS28M 26-28 207-223 10.4-10.8 1.04-1.08 ≥8.5 ≥676 ≥12 ≥955 -0.035 300 572
XGS28L 26-28 207-223 10.4-10.8 1.04-1.08 ≥6.6 ≥525 ≥8 ≥636 -0.035 250 482
XGS26H 24-26 191-207 10.0-10.4 1.00-1.04 ≥9.2 ≥732 ≥25 ≥1990 -0.035 350 662
XGS26 24-26 191-207 10.0-10.4 1.00-1.04 ≥9.0 ≥716 ≥18 ≥1433 -0.035 300 572
XGS26M 24-26 191-207 10.0-10.4 1.00-1.04 ≥8.5 ≥676 ≥12 ≥955 -0.035 300 572
XGS26L 24-26 191-207 10.0-10.4 1.00-1.04 ≥6.6 ≥525 ≥8 ≥636 -0.035 250 482
XGS24H 22-24 175-191 9.6-10.0 0.96-1.00 ≥8.8 ≥700 ≥25 ≥1990 -0.035 350 662
XGS24 22-24 175-191 9.6-10.0 0.96-1.00 ≥8.7 ≥692 ≥18 ≥1433 -0.035 300 572
XGS24M 22-24 175-191 9.6-10.0 0.96-1.00 ≥8.5 ≥676 ≥12 ≥955 -0.035 300 572
XGS24L 22-24 175-191 9.6-10.0 0.96-1.00 ≥6.5 ≥517 ≥8 ≥636 -0.035 250 482
XGS22H 20-22 159-175 9.1-9.6 0.91-0.96 ≥8.3 ≥660 ≥25 ≥1990 -0.030 350 662
XGS22 20-22 159-175 9.1-9.6 0.91-0.96 ≥8.3 ≥660 ≥18 ≥1433 -0.030 300 572
XGS22M 20-22 159-175 9.1-9.6 0.91-0.96 ≥8.1 ≥645 ≥12 ≥955 -0.030 300 572
XGS22L 20-22 159-175 9.1-9.6 0.91-0.96 ≥6.5 ≥517 ≥8 ≥636 -0.030 250 482
XGS20H 18-20 143-159 8.6-9.1 0.86-0.91 ≥7.8 ≥621 ≥25 ≥1990 -0.030 350 662
XGS20 18-20 143-159 8.6-9.1 0.86-0.91 ≥7.8 ≥621 ≥18 ≥1433 -0.030 300 572
XGS20M 18-20 143-159 8.6-9.1 0.86-0.91 ≥7.6 ≥605 ≥12 ≥955 -0.030 300 572
XGS20L 18-20 143-159 8.6-9.1 0.86-0.91 ≥6.5 ≥517 ≥8 ≥636 -0.030 250 482
Low Reversible Temperature Coefficient Sm2Co17 Magnets
XGS24LT 22-25 175-199 9.5-10.1 0.95-1.01 ≥8.7 ≥692 ≥18 ≥1433 -0.015 300 572
XGS22LT 20-23 159-183 9.1-9.7 0.91-0.97 ≥8.3 ≥660 ≥18 ≥1433 -0.010 300 572
XGS20LT 18-21 143-167 8.6-9.3 0.86-0.93 ≥7.8 ≥621 ≥18 ≥1433 -0.010 300 572
XGS18LT 16-19 127-151 8.1-8.8 0.81-0.88 ≥7.5 ≥597 ≥18 ≥1433 -0.005 300 572
Ultra High Temperature Sm2Co17 Magnets
XGS24HT 22-25 175-199 9.5-10.1 0.95-1.01 ≥8.7 ≥692 ≥20 ≥1592 -0.035 450 842
XGS22HT 20-23 159-183 9.1-9.7 0.91-0.97 ≥8.3 ≥660 ≥20 ≥1592 -0.035 500 932
Regular SmCo5 Magnets / Samarium Cobalt 1:5
XG24H 22-25 175-199 9.5-10.2 0.95-1.02 ≥9.0 ≥716 ≥23 ≥1830 -0.045 250 482
XG24 22-25 175-199 9.5-10.2 0.95-1.02 ≥9.0 ≥716 ≥15 ≥1194 -0.050 250 482
XG22H 20-22 159-175 9.0-9.5 0.90-0.95 ≥8.5 ≥676 ≥23 ≥1830 -0.045 250 482
XG22 20-22 159-175 9.0-9.5 0.90-0.95 ≥8.5 ≥676 ≥15 ≥1194 -0.050 250 482
XG20H 18-20 143-159 8.6-9.0 0.86-0.90 ≥8.2 ≥653 ≥23 ≥1830 -0.045 250 482
XG20 18-20 143-159 8.6-9.0 0.86-0.90 ≥8.2 ≥653 ≥15 ≥1194 -0.050 250 482
XG18H 16-18 127-143 8.2-8.6 0.82-0.86 ≥7.8 ≥620 ≥23 ≥1830 -0.040 250 482
XG18 16-18 127-143 8.2-8.6 0.82-0.86 ≥7.8 ≥620 ≥15 ≥1194 -0.050 250 482
XG16H 14-16 111-127 7.7-8.2 0.77-0.82 ≥7.4 ≥589 ≥23 ≥1830 -0.040 250 482
XG16 14-16 111-127 7.7-8.2 0.77-0.82 ≥7.4 ≥589 ≥15 ≥1194 -0.050 250 482

[1] In a SmCo magnet grade code, “XGS” means it is a samarium cobalt 2:17 magnet. The following number is typical (BH)max value of this Sm2Co17 magnet. The end with “H/M/L” (high/medium/low, regular is default) indicates intrinsic coercivity class, “LT” (low reversible temperature coefficient) indicates it is for ultra high thermal stability application, “HT” indicates it is for ultra high temperature application.
[2] Besides, “XG” means it is a samarium cobalt 1:5 magnet. The following number is typical (BH)max value of this SmCo5 magnet, the end with “H” (high, regular is default) indicates intrinsic coercivity class.
[3] Typical reversible temperature coefficient (RTC) of Br [α(Br)] between 20 and 150 °C (68-302 °F).
[4] Maximum operating temperature is strongly related to the load line/Pc (permeance coefficient) and operating environment of a SmCo magnet.
* The values in this sheet are for reference only, SmCo magnets can be tailored as per customers’ specific requirements.