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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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This 1mmx1mm miniature circular magnet has a compact size and a surface magnetic field of approximately 2900 Gauss, making it suitable for precision applications with high requirements for magnet size....
This product is a miniature round magnet, made of rare earth NdFeB magnets, belonging to the ultra-small size magnet series, using N35 grade, the specific size is 1.5mm diameter, 1mm thickness, axial magnetization, surface nickel coating, tolerance ±0.05, such as If you are interested in this small magnet product, you can contact us to customize it for you....
Customers from the United States, the United Kingdom, Australia, Japan, Poland and other customers are looking for ferrite cylindrical magnets. Welcome to contact the Courage magnet manufacturer. Our company is located in Dongguan, China. There are many ready-made sizes and low prices. Like the main picture...
The sample is a small-sized Y35 ferrite magnetic block with a specification of 3 × 1.3 × 4mm, magnetized along the length direction, and a surface magnetic field of about 1300 Gauss....
This is a very small rectangular ferrite block magnet, measuring 2.45 mm in length and 1 mm in both width and height. It is magnetised along its length and is barely noticeable when held in the hand....
7.4x6x5mm Ferrite Small Block Magnet Introduction，Material: Hard Ferrite (Ceramic)，Shape: Block / Rectangle / Bar，Coating: No Coating，Grade (Chinese Stardard): Y30，Operating temperature: -40°C to 250°C，Delivery time: 7-15 days，Magnetization direction: thickness....
U-shaped neodymium magnets are a type of high-performance permanent magnet material with a structure resembling the letter ‘U’. Manufactured from sintered neodymium-iron-boron, they are characterised by high magnetic energy product....
This is a radial 4-pole ring (Hollow cylinder) magnet, the material is bonded NdFeB, with high magnetic performance, the size is 16mm outer diameter, inner hole 5mm, height 20mm, surface gray epoxy treatment, suitable for water pump motor...