The SmCo₅ series represents the original rare-earth cobalt magnet composition, known for its excellent corrosion resistance and reliable magnetic output . With a maximum operating temperature of 250°C, these magnets offer a good balance of magnetic properties and machinability .

The Sm₂Co₁₇ series is the industry standard for high-performance applications, offering higher magnetic energy products and superior temperature characteristics . Capable of operating continuously at up to 350°C, these magnets feature an extremely low temperature coefficient (as low as -0.035%/°C)