Most of us have heard of permanent magnets, and even used them, yet when asked what a permanent magnet is, how many types of permanent magnets there are, and what their applications are, few can give a clear answer.
Therefore, in today's article, we will try to answer the above questions one by one.
A magnet that can maintain its magnetism for a long time is called a permanent magnet, such as natural magnets (magnetite) and artificial magnets.
Permanent magnets are not easily demagnetized or magnetized, and their polarity does not change. However, if a permanent magnet is heated above its Curie temperature or is in an environment with a high reverse magnetic field strength, its magnetism will weaken or disappear.
Some permanent magnets are relatively brittle and may break at high temperatures. For example, the maximum operating temperature of Alnico magnets exceeds 540 °C (1,000 °F), the maximum operating temperature of samarium-cobalt and ferrite magnets is approximately 300 °C (570 °F), while the maximum operating temperature of neodymium magnets and soft magnets is approximately 140 °C (280 °F).
The first type of permanent magnet is alloy permanent magnet materials, including rare earth permanent magnet materials, such as Nd2Fe14B, SmCo, and AlNiCo.
The second type of permanent magnet is ferrite permanent magnet materials. Ferrite permanent magnet materials can be divided into sintered ferrite, bonded ferrite, and injection-molded ferrite according to their different production processes.
In addition, Cu-Ni-Fe, Fe-Co-Mo, Fe-Co-V, MnBi, and A1MnC alloys have historically been used as permanent magnet materials. However, due to the lower performance and higher cost of these alloys, they are rarely used in most applications.
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Related reading: Neodymium Iron Boron Magnets
Permanent magnets have a wide range of applications. For example, you can find them in televisions, speakers, radios, handbag clasps, data cable magnetic rings, computer hard drives, and mobile phone vibrators. In short, permanent magnets are everywhere in people's lives, greatly facilitating our production and life.
Thank you for reading this article. We hope it has helped you better understand permanent magnets, their types, and applications.
If you would like to learn more about permanent magnets, we encourage you to visit our website. As a leading global supplier of magnets, we are dedicated to the research, development, manufacturing, and sales of permanent magnets, and we provide our customers with high-quality rare earth permanent magnet products, such as neodymium magnets, as well as other non-rare earth permanent magnets.
A permanent magnet is a magnet that keeps its magnetism for a long time. This includes natural magnets like magnetite and man-made magnets. Their magnetic strength doesn’t change easily, but heat or a strong reverse magnetic field can weaken or erase it. Some magnets can be damaged by high temperatures, with different materials lasting to different limits (for example, Alnico up to about 540°C, ferrite around 300°C, and neodymium magnets about 140°C).
There are two main groups of permanent magnets. Alloy magnets include rare earth types such as Nd2Fe14B, SmCo, and AlNiCo. Ferrite magnets are made from iron oxides and come in various production forms like sintered, bonded, or molded. Other alloys have been used in the past, but they are less common today.
Permanent magnets are found in many devices, from TVs and speakers to hard drives and phone vibrations, making them integral to everyday life.