SmCo Magnets
SmCo Magnets
High-Temperature & High-Performance Rare Earth Magnetic Solutions
As a high-end rare earth permanent magnetic material, TOPMAG’s SmCo Magnets are composed of samarium, cobalt and other rare earth elements. With ultra-high temperature resistance (up to 550°C), high magnetic energy product, extremely low temperature coefficient, and excellent corrosion resistance, they are irreplaceable in high-end industrial equipment, aerospace, and extreme working conditions that require both high magnetic performance and high temperature resistance. Guided by the Chinese headquarters, we adhere to strict production standards to provide global customers with stable and reliable SmCo magnet products.
Product Categories
TOPMAG’s SmCo Magnets are mainly classified by alloy composition (main grades) and product shape, covering all mainstream specifications in the industry, and can be customized according to customer high-temperature/high-performance requirements.
Classification by Alloy Composition (Main Grades):
SmCo5
Sm2Co17
Custom Grades
Classification by Product Shape：
Cylindrical magnets
Block magnets
Ring magnets
Disc magnets
Arc magnets
Custom Shapes
Technical Specifications
Customizable according to customer needs, typical parameters of mainstream grades are as follows.
Grades & Specifications of SmCo Magnets
| Parameter | SmCo5 | Sm2Co17 | Custom Grades (Note) |
|---|---|---|---|
| Magnetic Energy Product (BH)max | 18-28 MGOe (74-115 kJ/m³) | 20-30 MGOe (82-124 kJ/m³) | Customizable |
| Remanence (Br) Min | 950-1100 mT (9500-11000 Gauss) | 1000-1150 mT (10000-11500 Gauss) | Customizable |
| Coercivity (HcJ) Min | 600-800 kA/m (7530-10040 Oe) | 700-900 kA/m (8790-11300 Oe) | Customizable |
| Max Operating Temperature | 350°C (662°F) | 550°C (1022°F) | Up to 600°C (short-term) |
| Temperature Coefficient of Remanence (αBr) | -0.04%/°C (20-100°C) | -0.03%/°C (20-100°C) | Optimizable |
Dimensional Tolerance: ±0.01mm (standard), customizable to ±0.005mm for precision requirements; maximum size: length ≤ 300mm, width ≤ 200mm, thickness ≤ 50mm (customizable for larger sizes)
Magnetization Direction: Axial magnetization, radial magnetization, multi-pole magnetization, custom magnetization direction (according to customer needs)
Surface Treatment: No coating (standard); optional passivation treatment (for special extreme corrosive environments)
Density: 8.1-8.3 g/cm³
Core Features
Samarium Cobalt (SmCo) magnets are prized for their exceptional high-temperature performance and outstanding corrosion resistance, making them the preferred choice for aerospace, defense, and precision instrumentation applications. Their premium value is defined by several distinctive performance characteristics:
Ultra-High Temperature Resistance
The core advantage of SmCo Magnets, with a maximum operating temperature of up to 550°C (continuous use) and short-term resistance to 600°C, which is far higher than NdFeB Magnets (up to 200°C) and comparable to high-grade Alnico Magnets, while maintaining higher magnetic energy product than Alnico Magnets. No obvious demagnetization occurs in long-term high-temperature environments, suitable for extreme high-temperature working conditions
High Magnetic Energy Product
As a rare earth magnetic material, SmCo Magnets have high magnetic energy product (up to 30 MGOe), much higher than Alnico (max 7 MGOe) and Ferrite (max 4.4 MGOe), and second only to high-grade NdFeB Magnets, achieving a perfect balance between high magnetic performance and high temperature resistance
Extremely Low Temperature Coefficient
The temperature coefficient of remanence is as low as -0.03%/°C (between 20-100°C), which is much lower than NdFeB (-0.12%/°C) and Ferrite (-0.15%/°C). The magnetic performance changes little with temperature, ensuring stable operation in wide temperature range environments
Excellent Corrosion Resistance
Relying on the unique advantages of ultra-high temperature resistance, high magnetic energy product and low temperature coefficient, TOPMAG’s SmCo Magnets are widely used in high-end manufacturing, aerospace, military industry and other fields that have strict requirements on magnetic performance and working environment, and are irreplaceable in extreme working conditions
No Magnetic Aging
The magnetic performance is extremely stable, with no obvious attenuation even after long-term use (less than 1% attenuation in 20 years), and no risk of sudden demagnetization, suitable for long-life equipment such as aerospace and precision instruments
Moderate Machinability
Although it has certain brittleness (lower than NdFeB), it can be processed into regular shapes (cylinder, block, ring) through precision grinding, and special-shaped products can be customized according to customer needs with professional processing technology
Widely Applications
Relying on the unique advantages of ultra-high temperature resistance, high magnetic energy product and low temperature coefficient, TOPMAG’s SmCo Magnets are widely used in high-end manufacturing, aerospace, military industry and other fields that have strict requirements on magnetic performance and working environment, and are irreplaceable in extreme working conditions.
• Aerospace & Aviation——Core components of aircraft engines, aerospace propulsion systems, satellite attitude control components, and missile guidance systems. It can maintain stable magnetic performance in extreme environments such as high temperature, high pressure, and strong radiation, ensuring the reliability of aerospace equipment
• High-Temperature Industrial Equipments——Applied to high-temperature motors, high-temperature sensors, heat treatment furnace components, and high-temperature magnetic separators in metallurgy, petrochemical, and nuclear energy industries. It can work stably for a long time at 300-550℃, solving the problem of magnetic material failure under extreme high-temperature conditions
• Military & Defense——Used in military radar components, communication equipment, submarine detection systems, and high-temperature weapon components. It has strong anti-interference ability, stable performance, and meets the strict environmental requirements of military equipment
• Precision Instruments & Semiconductor Equipment——Core magnetic components of high-precision measuring instruments, semiconductor manufacturing equipment, and vacuum coating equipment. The low temperature coefficient ensures measurement accuracy and equipment stability in temperature-varying environments
• Automotive High-End Components——Applied to new energy vehicle high-temperature motor components, engine control systems, and exhaust gas detection sensors. It adapts to the high-temperature working environment of automotive engines and improves the service life of components
• Other High-End Fields——Also used in nuclear magnetic resonance (NMR) equipment, high-energy physics experimental equipment, and marine deep-sea detection equipment, covering all high-end fields with high requirements for magnetic performance and environmental adaptability
Quality Assurance
In line with TOPMAG’s global high-end magnetic material quality standards, guided by the Chinese headquarters, we implement a full-process strict quality control system for SmCo Magnets (a high-value rare earth material), from raw material procurement to finished product delivery, to ensure that each product meets international high-end industry standards and customer personalized requirements.
| Process Step | Detailed Description |
|---|---|
| 1. Raw Material Control | The Chinese headquarters strictly purchases high-purity samarium, cobalt and rare earth raw materials from qualified suppliers, and conducts multi-dimensional testing (purity, composition, isotopic ratio) on each batch of raw materials to ensure the stability of raw material performance and eliminate unqualified raw materials. |
| 2. Production Process Control | Adhere to the ISO 9001 and IATF 16949 quality management system standards, the Chinese headquarters dispatches senior engineers to supervise the key processes (smelting, sintering, heat treatment, precision machining) of SmCo Magnets, and real-time monitor process parameters (temperature, time, pressure) to ensure consistent product performance. |
| 3. Finished Product Testing | Each batch of SmCo Magnets is sent to the Chinese national-level magnetic material testing center for full-item testing, including magnetic performance (high-temperature magnetic performance test at 550°C), dimensional accuracy, temperature coefficient, corrosion resistance, etc. A detailed third-party inspection report is attached to each shipment. |
| 4. Customized Service Guarantee | The Chinese headquarters has a professional R&D team focusing on rare earth magnetic materials, which can provide customized formula R&D, process optimization and product production according to customer high-temperature/high-performance requirements, and provide technical solutions throughout the process. |
| 5. After-Sales Service | Provide global technical support and after-sales service, the Chinese headquarters technical team can respond to customer quality feedback within 24 hours, and provide on-site technical support for key customers, ensuring the stable application of SmCo Magnets in high-end equipment. |
Sample Center
We provide free Samarium Cobalt (SmCo) magnet samples (only freight is charged) to help you verify product performance before mass purchase. Sample application process:
Looking for a reliable Samarium Cobalt (SmCo) magnet supplier? Contact TOPMAG now! We provide customized solutions based on your specific application requirements, including shape, grade, surface treatment and performance customization. Professional technical team, 24-hour online consultation, global logistics support.
