NEODYMIUM MAGNET
The Neodymium Iron Boron magnet (NdFeB magnet) is a tetragonal crystal compound formed from neodymium, iron, and boron (Nd₂Fe₁₄B). In 1982, Masato Sagawa of Sumitomo Special Metals discovered the neodymium magnet.
This type of magnet has a maximum energy product (BHmax) greater than that of samarium–cobalt magnets, making it the material with the highest magnetic energy product in the world at that time. Later, Sumitomo Special Metals successfully developed the powder metallurgy process, while General Motors developed the melt-spinning process, enabling the industrial production of NdFeB magnets.
Today, NdFeB magnets are the strongest permanent magnets available and the most widely used rare-earth magnets. They are extensively applied in electronic products such as hard disk drives, mobile phones, headphones, and battery-powered tools.
To prevent corrosion damage, the surface of the permanent magnet material is usually protected through surface treatments, such as electroplating with gold, nickel, zinc, or tin, or coating with epoxy resin.
- Extremely strong magnetic force with high resistance to demagnetization.
- High cost-performance ratio.
- Very hard but brittle in nature.
- High corrosion resistance after electroplating.
- Moderate temperature stability, generally not suitable for high operating temperature environments.
- Tight tolerances can be precisely controlled.
- Mobile phones and 3C products.
- Magnetic mounts / magnetic holders.
- Generators.
- Motor sensors.
- Speakers.