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What is a neodymium magnet?

What is a neodymium magnet?

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Neodymium disc magnet A neodymium magnet (neo-magnet) contains neodymium, iron and boron amongst a few other elements. It is the strongest type of magnet commercially available.
  Wonkee Donkee says neodymium magnets are ferromagnetic, this means they are permanently magnetic
NdFeb Neodymium iron boron magnets (NdFeB) became available to the public in 1984 after being developed a few years earlier.

Advantages of neodymium magnets

Neodymium magnets
  • They are the strongest permanent magnet available. Even small neodymium magnets have a large amount of magnetic force and are capable of lifting more than 1000 times their own weight.
  • They have a high resistance to demagnetization.
  • Even smaller neo-magnets have a high energy.
  • They are very low priced.
  Wonkee Donkee says being a permanent magnet means that it stays magnetized and is very hard to demagnetize.

Disadvantages of neodymium magnets

Neodymium magnets
  • Neodymium magnets are very corrosive and have to be handled carefully. To aid this they are coated, for maximum efficiency.
Disc magnets with a nickel copper coating

What are neodymium magnets coated with?

Neodymium magnets are coated to protect them from corrosion, as they are 75% iron based. The standard coating for neodymium magnets is nickel-copper-nickel, although many other coatings are available.

The coating will protect the magnet from various forms of moisture, however if the coating is scratched or broken it will no longer protect the magnet.

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