Thermal
High Working Temperature
Continuous operation up to 250–350°C with minimal irreversible demagnetization—ideal for high-temperature motors and aerospace systems.
Samarium-Cobalt (SmCo) Magnets
High-temperature permanent magnets engineered for critical applications. Stable, corrosion-resistant, and ideal for aerospace, motors, sensors and harsh environments.
What are SmCo Magnets?
Samarium-Cobalt (SmCo) magnets are high-performance rare-earth permanent magnets made from samarium (Sm) and cobalt (Co). They deliver exceptional thermal stability, excellent corrosion resistance, and strong magnetic performance—making them the preferred solution for extremely demanding environments from −273°C to 350°C.
As one of the earliest rare-earth magnets, SmCo remains the best choice where thermal performance, reliability, and dimensional stability are mission-critical.
Key Features of SmCo Magnets
Stability
Excellent Magnetic Stability
Low temperature coefficient and outstanding resistance to demagnetization ensure long-term stable performance in precision applications.
Durability
Corrosion Resistance
SmCo is inherently corrosion-resistant. In many environments, magnets can be used without coating, reducing process steps and risk.
Design
Custom Shapes & Directions
Blocks, discs, rings, arcs and complex segments with axial, radial or multi-pole magnetization per customer drawings.
Typical Applications
High-Temperature Motors
- Servo motors and traction motors
- Spindle motors and high-speed rotors
- Reliable torque output at elevated temperatures
Aerospace & Defense
- Actuators and control systems
- Guidance & navigation modules
- Magnetic components in harsh environments
Sensors & Encoders
- Position and speed sensors
- High-precision encoders
- Low drift over temperature and time
Magnetic Assemblies
- Couplings and magnetic pumps
- Hybrid rotor assemblies
- High-reliability permanent magnet systems
SmCo Magnet Grades
We supply both SmCo5 (1:5) and Sm2Co17 (2:17) grades.
| Grade | Br (kGs) | Hcj (kOe) | (BH)max (MGOe) | Max Operating Temp. |
|---|---|---|---|---|
| SmCo5 | 7.0–9.0 | 12–18 | 14–22 | 250°C |
| Sm2Co17 | 8.5–11.5 | 20–32 | 20–32 | 350°C |
| Custom Grades | Available for special applications upon request | |||
Tolerances & Coating Options
Standard Tolerances
- Blocks: ±0.05 mm
- Rings: ±0.05 mm (ID/OD), ±0.10 mm (H)
- Discs: ±0.05 mm (D), ±0.10 mm (H)
- Tighter tolerances available per request
Coating Options
SmCo generally does not require coating, but we offer surface treatments for specific environments:
- Nickel (Ni), NiCuNi
- Black epoxy
- Passivation
- Custom coatings for assemblies
Manufacturing & Engineering Capabilities
Precision Machining
- Multi-axis grinding & cutting
- Thin-wall rings and small-size parts
- Low chipping and high consistency
Magnetic Design Support
- Magnetic circuit optimization
- FEM simulation for complex projects
- Design-for-manufacturing guidance
Assembly Integration
- Bonded magnets and metal housings
- Rotor sets and magnetic couplings
- Full inspection and traceability
SmCo Magnets – FAQ
Is SmCo stronger than Neodymium?
Neodymium (NdFeB) is magnetically stronger, but SmCo offers superior high-temperature stability and corrosion resistance.
Do SmCo magnets rust?
SmCo has very good natural corrosion resistance. Coating is optional and mainly used for assemblies or extreme environments.
SmCo5 vs Sm2Co17 – which to choose?
Sm2Co17 provides higher energy product and higher working temperature. SmCo5 is easier to magnetize and may be preferred for certain designs.
Can you support custom assemblies?
Yes. We design and produce SmCo-based magnetic assemblies including rotors, couplings and sensor components with full engineering support.
Need SmCo Magnets for High-Temperature Applications?
Share your drawings, working temperature and performance requirements. Our engineering team will recommend the right SmCo grade and magnet solution for your project.