Low reversible temperature coefficient (RTC) SmCo magnets have been developed, providing near constant magnetic field over a temperature range. These SmCo magnets have better reversible temperature coefficient of Br [α(Br): +0.01 to -0.02%/°C] than those of regular SmCo magnets [α(Br): -0.03 to -0.05%/°C]. They are also called temperature compensated SmCo magnets.
Low RTC SmCo Magnets’ Magnetic Characteristics
| Magnet Grade |
Max. Energy Product (BH)max |
Residual Induction Br |
Coercive Force Hcb |
Intrinsic Coercivity Hcj |
RTC of Br α(Br)[1] |
Max. Operating Temp.[2] |
|||||
| MGOe | kJ/m3 | kGs | T | kOe | kA/m | kOe | kA/m | %/°C | °C | °F | |
| 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 |
[1] Typical reversible temperature coefficient (RTC) of Br [α(Br)] between 20 and 150 °C (68-302 °F).
[2] 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.
Low RTC SmCo Magnets’ Applications
Accelerometers, gyroscopes, traveling wave tubes, klystrons, magnetrons, magnetic sensors, etc.