Samarium-cobalt (SmCo) permanent magnets exhibit minimal variation in magnetic properties with temperature changes. Their demagnetization at elevated temperatures is only one-quarter to one-third that of NdFeB magnets, with a maximum operating temperature exceeding 250 °C. They offer excellent thermal stability and corrosion resistance. As a result, SmCo permanent magnets are widely used in demanding applications such as automotive components, high-temperature motors operating in harsh environments, and high-precision sensors.

Tianhe Magnetic Materials primarily produces SmCo permanent magnets in the 1:5 and 2:17 series. In addition to standard grades, the company also offers LT series grades, which feature an extremely low temperature coefficient of magnetic properties (−0.008%/°C from 20 °C to 200 °C).