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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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Will the magnet coating (plating) affect the magnetic strength of the magnet?
This is a small size ring rare earth magnet, N38M grade, the outer diameter of the ring is 11mm, the hole is 2mm, which is also relatively small, the thickness is 5mm, the surface is plated with bright nickel, this type of magnet is suitable for passing through some thin shafts....
This is a very hot neodymium round magnet size, diameter 10mm, thickness 2mm, in many areas can be applied, the only difference is that different customers choose the coating, performance level and temperature resistance performance on the difference, the magnet weighs about 1.2g....
This product is a bowl-shaped magnet, because its shape is like the rice we eat. It is processed into a concave shape on the basis of a circular magnet, which belongs to the special-shaped magnet category. Our company is good at processing various complex special-shaped neodymium magnets. Welcome to all over the world. Customer service....
This is a ring magnet with an outside diameter of about 2 inches, belongs to medium size, made of rare earth neodymium material, the hole in the center is 40mm, thickness 5mm, the customer chooses N38 grade,...
Product is a Y30 (C8) grade round ferrite magnet, the N pole has a pit, the surface magnetic field strength is about 1300 Gauss, the specific size is 18mm in diameter, 8mm in thickness, magnetized in the thickness direction, and the tolerance is ±0.1mm....
You are now browsing this is a 4 inch ceramic ferrite ring magnet, by the courage magnet manufacturers physical samples photographed, magnetic ring outer diameter 110mm, hole 50mm, thickness 6mm....
You are now browsing this magnet is the diameter of 80mm series of round rare earth magnets, the thickness of 10mm, nickel-plated surface, the thickness of the magnetization....
We can provide various sizes of thin rectangular neodymium magnets, ultra-thin round magnets, ultra-thin square magnets, with high dimensional accuracy, stable performance is not easy to demagnetize, welcome to contact us for a quote....