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List of Magnets That Can Withstand High Temperatures


The strength of different magnets is affected by shapes, sizes, and most importantly, the ambient temperature. Therefore, it is rather significant to know about the influence of temperature on the magnetic force before selecting your magnets. Here, this article is going to discuss such influence with several examples of high-temperature resistant magnets.

magnets that can withstand high temperatures magnets that can withstand high temperatures

How Can Temperature Affect Magnets?

First, let’s learn about how temperature affects magnets with some basic information.

  • Cold Rather Than Hot: Generally, heat reduces the magnetic force, while cold strengthens magnetism. Magnets have a preference for cold surroundings, so using them under room temperature could work.
  • Maximum Operating Temperature VS. Curie Temperature: If you heat your magnets to their maximum operating temperature, they will lose some magnetic strength irreversibly. If the ambient temperature exceeds Curie temperature, all the magnetization would be lost. Both maximum operating temperature and Curie temperature vary according to the types and grades of magnets.
  • Reversible Loss VS. Irreversible Loss: Bring your magnets back down to room temperature, and reversible losses can be recovered. Nevertheless, magnets with irreversible losses can’t recover the magnetization they lose.

Magnets That Can Withstand High Temperatures

Second, let’s take a look at several strong magnets that can tolerate high temperatures. You can check the table below to find their corresponding maximum operating temperatures and Curie temperatures.

Table 1 Maximum Operating Temperatures and Curie Temperatures

  Maximum Operating Temperature/ Curie Temperature/
Al-Ni-Co Magnet 525 800
Ferrite Magnet 250 450
Sm-Co Magnet 310-400 700-800
Nd-Fe-B Magnet M (80-100), H (100-120), SH (120-150), UH (150-180), EH (180-200). 310-400

1.   Al-Ni-Co Magnet - 525℃

Al-Ni-Co magnets are composed of aluminum, nickel, cobalt, and iron, and these magnets possess the highest maximum operating temperature of 525℃. Thus, they are suitable for extremely high-temperature workplaces. Additionally, Al-Ni-Co magnets appeared in the market quite early. They were commercially available in the 1960s and were replaced by rare earth magnets in the 1980s. Yet, these tough magnets are still commonly used to make sensors, guitar pickups, and other high-temperature handling equipment.

Related reading: What Is an Alnico Magnet & What Is an Alnico Magnet Used for?

2.   Ferrite/Ceramic Magnet - 250℃

Ferrite magnets contain a large amount of iron oxide and a small proportion of other metallic elements. Although ferrite magnets come with a relatively lower maximum operating temperature of 250℃, they are widely used because of their lower cost. They are also called ceramic magnets due to their extremely high electrical resistance. With these desirable features, ferrite magnets find various applications, such as transformers, computer cables, and so on.

Ferrite Magnets

Figure 2 Ferrite Magnets

3.   Sm-Co Magnet - 310~400℃

Sm-Co magnets come with strong magnetic power and a maximum operating temperature ranging from 310 to 400℃. Although they are less strong than neodymium magnets, Sm-Co magnets have higher temperature ratings, making them suitable for applications involving high or extremely low temperatures. Besides, these magnets have notable properties like good oxidation resistance, corrosion resistance, and extreme demagnetization resistance. Stanford Magnets has rich experience and advanced technology in the manufacturing and supplying of samarium cobalt magnets. There are mainly two types of Sm-Co magnets (series 1:5 and series 2:17) available on our website. Send us an inquiry if you are interested.

4.   Nd-Fe-B Magnet - 80~200℃

Nd-Fe-B magnets, or neodymium magnets, are the most commercially available magnet and their working temperature can reach up to 200 degrees Celsius. It is the most commercially available magnet and its working temperature can reach up to 200 degrees Celsius. Neodymium magnet is classified by temperature as M (80-100 ℃), H (100-120 ℃), SH (120-150 ℃), UH (150-180 ℃), EH (180-200 ℃). The magnetic strength of NdFeB magnets is closely related to the change in ambient temperature. Within the working temperature range, neodymium magnets lose 0.11% of their magnetism when the temperature rises by 1 ℃. After cooling, most of the magnetic force can return to the original level, which is reversible. This is irreversible if the temperature reaches Curie’s and parts of the magnet move violently and demagnetize.

Neodymium Magnets

Figure 3 Neodymium Magnets


Al-Ni-Co magnets, ferrite magnets, Sm-Co magnets, and neodymium magnets are strong magnets with impressive high-temperature resistance. But remember to check their respective maximum operating temperatures and Curie temperatures in advance. Stanford Magnets is a leading supplier of permanent magnets that can withstand high temperatures. Visit our homepage to get high-quality magnets for your home or business.  

About the author

Cathy Marchio

Cathy Marchio is an expert at Stanford Magnets, where she shares her deep knowledge of magnets like Neodymium and Samarium Cobalt. With a background in materials science, Cathy writes articles and guides that make complex topics easier to understand. She helps people learn about magnets and their uses in different industries, making her a key part of the company's success.

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