Samarium Cobalt Magnet Grades: Grades and Strengths


In the fast-paced development of modern technology and industry, magnets play a crucial role. Among them, Samarium Cobalt (SmCo) magnets stand out for their exceptional performance and unique properties. While most people are more familiar with Neodymium magnets, Samarium Cobalt magnets excel in high-temperature environments and boast superior resistance to demagnetization.

This article focuses on exploring the various grades and strengths of Samarium Cobalt magnets, helping you understand their practical performance and selection criteria in different applications. To provide a comprehensive understanding, we will also delve into the composition, characteristics, and broad applications of SmCo magnets. Whether you are a technical expert or new to the industry, this guide will reveal the allure of Samarium Cobalt magnets and their significance in high-tech fields. Ready to explore this fascinating world of magnets? Let's get started!


Table of Contents

  1. Introduction to Samarium Cobalt Magnets
  2. Composition and Characteristics of Samarium Cobalt Magnets
  3. Classification of Samarium Cobalt Magnet Grades
  4. Strength of Samarium Cobalt Magnets
  5. Performance Comparison of Samarium Cobalt Magnet Grades
  6. Applications of Samarium Cobalt Magnets
  7. Conclusion


Introduction to Samarium Cobalt Magnets

Samarium Cobalt magnets were first developed in the 1960s and have since been a crucial component in various high-tech applications. They are composed primarily of samarium and cobalt, two rare earth elements that give these magnets their remarkable strength and stability. But the magic of Samarium Cobalt magnets doesn't stop at their composition. These magnets are part of the broader family of rare earth magnets, known for their high magnetic strength and resistance to demagnetization.

Imagine a magnet that can withstand extreme temperatures, resist corrosion, and maintain its magnetic properties over time. That's the beauty of Samarium Cobalt magnets. They are often the go-to choice for applications where reliability and performance are paramount. From aerospace to medical devices, SmCo magnets play a vital role in making modern technology more efficient and robust.

Composition and Characteristics of Samarium Cobalt Magnets

At the heart of Samarium Cobalt magnets lies a unique composition that sets them apart from other types of magnets. These magnets are primarily made up of two elements: samarium and cobalt. However, their exact composition can vary, leading to different grades with specific properties tailored to various applications.

Samarium, a rare earth element, contributes to the magnet's high magnetic strength and thermal stability. Cobalt, on the other hand, enhances the magnet's resistance to corrosion and demagnetization. The combination of these two elements creates a magnet that is not only powerful but also incredibly durable.

One of the standout characteristics of Samarium Cobalt magnets is their ability to operate at high temperatures. While many magnets lose their magnetic properties when exposed to heat, SmCo magnets can withstand temperatures up to 350°C (662°F) without significant loss of performance. This makes them ideal for use in environments where other magnets would fail, such as in aerospace engines or industrial machinery.

In addition to their thermal stability, Samarium Cobalt magnets also boast excellent resistance to demagnetization. This means they can maintain their magnetic strength over time, even when subjected to external magnetic fields. This property is particularly valuable in applications where maintaining a consistent magnetic force is crucial.

Another notable feature of SmCo magnets is their resistance to corrosion. Unlike Neodymium magnets, which require protective coatings to prevent rust, Samarium Cobalt magnets are naturally resistant to oxidation. This makes them suitable for use in harsh environments, including marine and chemical applications.

Classification of Samarium Cobalt Magnet Grades

Samarium Cobalt magnets are available in various grades, each with its own set of properties tailored to specific applications. These grades are primarily classified based on their magnetic strength and thermal stability. Understanding the different grades of SmCo magnets can help you choose the right one for your needs.

The two main series of Samarium Cobalt magnets are Sm1Co5 (commonly referred to as SmCo 1:5) and Sm2Co17 (SmCo 2:17). The numbers in these designations refer to the ratio of samarium to cobalt in the magnet's composition.

SmCo 1:5 magnets, with a composition of one part samarium to five parts cobalt, are known for their high magnetic strength and good temperature stability. They are often used in applications where strong magnetic fields are required, but the operating temperatures are relatively moderate.

SmCo 2:17 magnets, on the other hand, have a composition of two parts samarium to seventeen parts cobalt, along with other elements such as iron and copper. These magnets offer even greater thermal stability and can operate at higher temperatures than SmCo 1:5 magnets. This makes them ideal for high-temperature applications such as electric motors and generators.

Within these two series, Samarium Cobalt magnets are further classified into different grades based on their maximum energy product (BHmax), which is a measure of the magnet's strength. Higher BHmax values indicate stronger magnets. For example, a common grade in the SmCo 1:5 series is SmCo18, which has a BHmax of 18 MGOe (Mega Gauss Oersteds), while a typical grade in the SmCo 2:17 series is Sm2Co17-30, with a BHmax of 30 MGOe.

Strength of Samarium Cobalt Magnets

When it comes to magnetic strength, Samarium Cobalt magnets are among the top performers in the magnet world. Their high magnetic strength is one of the key reasons they are chosen for demanding applications.

The strength of a magnet is often measured by its maximum energy product (BHmax), which is the product of the magnet's remanence (Br) and coercivity (Hc). In simpler terms, it is a measure of how much magnetic energy the magnet can store. The higher the BHmax, the stronger the magnet.

Samarium Cobalt magnets, particularly those in the SmCo 2:17 series, boast some of the highest BHmax values among all magnets. For instance, grades like Sm2Co17-30 can have a BHmax of 30 MGOe or higher, making them extremely powerful. This high magnetic strength allows them to be used in applications where a strong magnetic field is crucial, such as in high-performance motors, sensors, and magnetic couplings.

But the strength of Samarium Cobalt magnets isn't just about their raw magnetic power. These magnets also excel in maintaining their strength over time and under challenging conditions. Their excellent resistance to demagnetization means they can sustain their magnetic properties even when exposed to external magnetic fields or high temperatures. This stability is a significant advantage in applications where consistent performance is essential.

Performance Comparison of Samarium Cobalt Magnet Grades

Comparing the performance of different Samarium Cobalt magnet grades can help you select the right magnet for your specific needs. Let's take a closer look at how the various grades stack up in terms of magnetic strength, thermal stability, and resistance to demagnetization.

In the SmCo 1:5 series, grades such as SmCo16, SmCo18, and SmCo20 are commonly used. SmCo16 has a BHmax of 16 MGOe, while SmCo18 and SmCo20 have BHmax values of 18 MGOe and 20 MGOe, respectively. These grades offer a good balance of magnetic strength and temperature stability, making them suitable for a wide range of applications.

In the SmCo 2:17 series, grades like Sm2Co17-24, Sm2Co17-26, Sm2Co17-28, and Sm2Co17-30 are popular. These grades have BHmax values ranging from 24 MGOe to 30 MGOe, with higher grades offering greater magnetic strength and thermal stability. For example, Sm2Co17-30, with a BHmax of 30 MGOe, can operate at temperatures up to 350°C (662°F), making it ideal for high-temperature environments.

When comparing the performance of these grades, it's essential to consider the specific requirements of your application. If you need a magnet with high magnetic strength and can tolerate moderate temperatures, a grade from the SmCo 1:5 series may be sufficient. However, if your application involves extreme temperatures or requires maximum magnetic strength, a higher grade from the SmCo 2:17 series would be a better choice.

Applications of Samarium Cobalt Magnets

Samarium Cobalt magnets are incredibly versatile and are used in a wide range of applications across various industries. Their unique properties make them ideal for situations where other magnets might fall short.

One of the most common applications of SmCo magnets is in the aerospace industry. These magnets are used in jet engines, where they need to withstand extreme temperatures and maintain their magnetic properties. Their high thermal stability and resistance to demagnetization make them perfect for this demanding environment.

In the medical field, Samarium Cobalt magnets are used in medical imaging devices such as MRI machines. These magnets need to produce strong, consistent magnetic fields to generate high-quality images. The stability and strength of SmCo magnets ensure reliable performance in these critical applications.

Another significant application of Samarium Cobalt magnets is in the production of electric motors and generators. These magnets provide the high magnetic strength needed to generate power efficiently. Their ability to operate at high temperatures without losing performance makes them ideal for use in industrial motors and wind turbines.

Samarium Cobalt magnets are also used in various types of sensors, including Hall effect sensors and magnetic field sensors. These sensors are essential in automotive and industrial applications, where precise measurements of magnetic fields are crucial.

In addition to these applications, SmCo magnets are used in magnetic couplings, which are devices that transmit torque through a magnetic field. These couplings are often used in pumps and mixers, where a hermetic seal is required to prevent contamination. The strength and stability of Samarium Cobalt magnets ensure reliable performance in these applications.


Samarium Cobalt magnets may not be as well-known as Neodymium magnets, but their unique properties make them indispensable in many high-tech applications. Their exceptional thermal stability, resistance to demagnetization, and high magnetic strength set them apart as the go-to choice for demanding environments. Whether you're working in aerospace, medical technology, or industrial applications, understanding the different grades and strengths of Samarium Cobalt magnets can help you choose the right magnet for your needs. These powerful and durable magnets truly are the unsung heroes of the magnet world.

Finally, allow me to introduce ourselves. UPSUN, a leading magnet manufacturer from China, offers high-quality samarium cobalt magnets in various shapes including blocks, discs, and rings. We also welcome customized products to meet your specific requirements. If you're interested in our magnetic solutions, please contact us and send us an inquiry. We look forward to providing you with professional magnet products tailored to your needs.

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