Rare-earth magnet
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A rare-earth magnet is a strong permanent magnet made from alloys of rare-earth elements. Developed in the 1970s and 1980s, rare-earth magnets are the strongest type of permanent magnets made, produci
Ferrofluid on glass, with a rare-earth magnet underneath
Neodymium magnet with nickel plating mostly removed
Neodymium magnet balls
Two objects made of neodymium magnets. The right object has the close-packing of equal spheres.
Samarium–cobalt magnet
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Samarium–cobalt magnets belong to the category of rare-earth magnets and are composed of samarium, a rare-earth element, and cobalt, a transition metal. They are among the strongest permanent magnets.
Rare-earth magnet
…magnets can exceed 1.2 teslas, whereas ferrite or ceramic magnets typically exhibit fields of 0.5 to 1 tesla. There are two types: neodymium magnets and samarium–cobalt magnets. Rare-earth magnets are extremely brittle and are vulnerable to corrosion, so they are usually plated or coated to protect them from breaking, chipping…
1980s vintage headphones using Samarium Cobalt magnets