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There are several measurements that affect the strength of the permanent magnet, which often seems confusing. Magnetic field strength (residual magnetism), resistance to demagnetization (coercivity) and tensile force are usually summarized as strength, all of which are ideal properties of permanent magnets.
The single main indicator of the strength of a permanent magnet is its maximum energy product measured in Megagauss Oersteds (MGOe). The higher the maximum energy product value, the larger the magnetic field generated by the magnet in a particular application.
The maximum energy product, also called BHmax, is calculated by multiplying the magnet's remanence (Br) and coercive force (Hc). The strongest magnets in the world are neodymium magnets. They come in different grades, but each grade has a convenient name that allows you to immediately judge which magnet is stronger. Commercially available neodymium magnets range from N35 to N52; the number after the letter "N" represents the maximum energy product of the magnet.
The individual properties of magnets will change due to temperature. Certain types of magnets perform better than others at high temperatures, such as Alnico magnets and Samarium Cobalt magnets.
In a high temperature environment, the five magnetic materials lose their magnetism at different speeds and have different maximum operating temperatures. If the temperature exceeds the maximum operating temperature of a single class, it will be permanently demagnetized.
In short, through proper maintenance and storage of magnets, permanent magnets can maintain their strength forever. However, if it is exposed to certain conditions, it will also lose its "permanent" magnetism. Ultimately, determining whether a permanent magnet will lose its magnetism over time depends on its specific application.
How to measure the magnetic field strength of a magnet?
You can use a Gauss meter to determine the strength of a magnet, you can use a Tesla meter to measure the magnetic field, a flux meter to measure the magnetic flux, or a tensile tester.
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