![]() For our purpose, we are going to use heat as the demagnetizing force as it is most common force effecting the magnet. When a letter is used after a magnet grade, it indicates that that specific material has a greater ability to fight demagnetizing forces. This letter system uses the following letters after the grade to define the magnets specification to fight demagnetization forces: M, H, SH, UH, EH, and TH.Ĭlick Here to view our Magnetic Tables & Curves Section In the world of permanent magnets, there are a couple of ways manufacturers or suppliers define the coercive force, but we will concentrate on the most widely used, which is the lettering system. These letters represent the magnet’s ability to withstand demagnetization forces, which can be temperature or other magnetic forces working against the magnet. When you look at a magnet table of available materials there are different letters after some of the grades. As you can see, the MGOe numbers for neodymium magnets is higher than those of samarium cobalt magnets, which indicates that neodymium magnets are stronger than samarium cobalt magnets.Ĭlick Here to Buy SmCo Magnets Online at SuperMagnetManįirst, let’s define Coercivity, or, the “Hci” of the material. The common grades for Samarium Cobalt magnets are 16, 18, 20, 22, 24, 26, 28, 30, and 32. ![]() ![]() Again, like neodymium magnets, the higher the number, the stronger the magnet. The most common grades of Neodymium magnets are N35, N38, N40, N42, N45, N48, N50, N52, and N55.Ĭlick Here to Buy Neodymium Magnets Online at SuperMagnetManįor Samarium Cobalt (SmCo) Magnets, the BHmax will range from 16 MGOe to 32 MGOe. Neodymium magnets produce the highest MGOe of any permanent magnet material. So, when defining your magnet need, keep in mind that the higher the number, the stronger the magnet. On a Magnetic Demagnetization Curve this is the highest point of the magnet’s strength, or the magnet’s maximum energy product.įor Neodymium (NdFeB) Magnets the BHmax will range, in general, from 30 MGOe to 55 MGOe. This is defined in Mega Gauss Oersteds, or MGOe. The strength of a magnet can be found in the magnet specification known as BHmax, which is the maximum energy density of a magnet. There are several factors and considerations that go into design, but for this article, the areas discussed will be Magnets Strength, Magnet Coercivity, and the Considerations for Magnet Selection. Neodymium Magnets and Samarium Cobalt Magnets are available in many grades. While these are only a few of the questions we could ask, this may lead to other questions about operating environments and options. Are there specific coating requirements?.Is the magnet in an assembly or operating independently?. ![]()
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