Neodymium (Rare Earth) Magnets
Discs, Rods, Cylinders, Blocks and Shallow Pots
Rare Earth magnets are magnets that are made of the Rare Earth group of elements. The most common Rare Earth magnets are the Neodymium-Iron-Boron and Samarium Cobalt types.
The most powerful magnets available today are the Rare Earths. Of the Rare Earths, Neodymium-Iron-Boron types are the strongest. However, at elevated temperatures (of approximately 150C and above), the Samarium Cobalt types can be stronger that the Neodymium-Iron-Boron types (depending on the magnetic circuit).
Neodymium magnets manufactured from sintered neodymium iron boron possess the most powerful magnetic properties in relation to volume and can lift 1000 times its own weight. However these magnets do not possess heat resistant qualities and usually remain stable in temperatures up to 80 C. For higher temperature applications, Rare Earth or Samarium Cobalt is recommended. Also due to the corrosive nature of this material, Neodymium is usually supplied nickel coated. These magnets are usually magnetised through the thickness, and are often used when space is limited and you need a lot of sticking power. Neodymium Magnets or Rare Earth magnets can be used for demonstrating attraction and repulsion, for science, engineering, research and development, education, industry, and magic.
Hard Neodymium discs, blocks or rings are sold individually and the uses are endless. Well, apart from having numerous industrial uses, these magnets can be used for just about anything where a strong magnet is required.
Note: The larger of these magnets are exceptionally strong and should be used with caution.