Rare earth, a strategic resource known as "industrial vitamins", play an irreplaceable and crucial role in the lifeblood of modern industry. Influence of Rare earth Materials has permeated various fields from basic manufacturing to cutting-edge technology, Rare earth Materials serve an invisible engine for industrial upgrading and technological innovation. When it comes to the rare earth industry, it is necessary to introduce rare earth permanent magnets. To understand the "capabilities" and application of permanent magnet material, one cannot do without interpreting its core performance parameters – these parameters are like the material's "identity code", which not only define the strength of the magnetic field it can generate and its ability to resist external interference, but also directly determine its performance and service life in different environments. The main performance parameters of permanent magnet materials are the core indicators for measuring their magnetic properties, directly affecting their applications in fields such as motors, sensors, and medical devices.

1. Remanence (Br)

Remanence, denoted as Br, refers to the magnetic induction intensity retained by a permanent magnet material when the external magnetic field is removed after it has been magnetized to saturation. Its unit is Tesla (T) or Gauss (Gs, 1T = 10,000Gs). Remanence indicates the material's ability to provide an external magnetic field, the higher the remanence, the stronger the magnetic field generated by the material in the same volume. For example, the remanence of neodymium-iron-boron magnets is usually 1.0-1.4T, which is much higher than that of ferrite magnets (0.2-0.5T).

2. Coercivity (Hcb and Hcj）

Coercivity, to be precise, is divided into coercivity induction (Hcb) and intrinsic coercive force (Hcj). The coercivity induction (Hcb) refers to the reverse magnetic field strength required to "temporarily" reduce the internal magnetic induction intensity of a magnet to zero when the magnet is magnetized in the reverse direction. It reflects the "threshold" of the material's ability to resist demagnetization.

The intrinsic coercive force (Hcj) is the reverse magnetic field strength that needs to be applied to permanently reduce the magnetization intensity of the magnet to zero. Therefore, the intrinsic coercive force is greater than the coercivity for sure .

3. Maximum energy product (BHmax)

Maximum energy product (BHmax) refers to the maximum magnetic energy density that a permanent magnet material can provide on the demagnetization curve, with units of kilojoules per cubic meter (kJ/m³) or mega gauss-oersteds (MGOe, 1MGOe ≈ 7.96kJ/m³). It is a comprehensive indicator of the "strength of magnetic properties" of the magnetic material. The higher the (BH)max, the smaller the volume of the material can be under the same performance requirements.

These three are all intrinsic parameters of magnets. In practical applications, we also need to consider external factors, namely humidity and temperature. The impact of humidity on magnetic materials can be addressed through different material coatings, but paying attention to the operating temperature of the magnetic material is even more crucial. The operating temperature refers to the maximum temperature at which the material can stably maintain its magnetic properties (usually lower than Tc). Exceeding the operating temperature will cause demagnetization, and if it is higher than the Curie temperature, irreversible demagnetization may occur.

Different permanent magnet materials have significant differences in their operating temperatures. For example, neodymium-iron-boron magnets are classified by grades with maximum operating temperatures of 80°C, 100°C, 120°C, 150°C, 200°C, and the highest being 230°C. In contrast, samarium-cobalt magnets can reach a maximum operating temperature of 250-350°C, and alnico magnets can even go as high as over 500°C.

Saint Langma Group specializes in the production and sales of rare earth permanent magnet materials (neodymium-iron-boron, samarium-cobalt alloys, alnico, etc.) and their application products (various magnetic rods, magnetic frames, magnetic cages, magnetic fishing tools, magnetic separation equipment, permanent magnetic separators, etc.). It also engages in the research and development of fluid environmental protection technologies and various purification equipment (water filters, oil filters, media filters, etc.).

Our products are widely used in industrial fields such as energy power generation, iron and steel petrochemicals, shipbuilding, and automobile manufacturing; high-tech fields including intelligent robots, low-altitude economy, biomedicine, and new energy batteries; as well as daily life fields like food processing, smart home, and 3C equipment.

If you have needs for rare earth permanent magnet products, permanent magnetic iron removal equipment, or media filtration equipment, please feel free to contact us now！