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These samarium–cobalt magnet alloys (generally written as SmCo 5, or SmCo Series 1:5) have one atom of rare-earth samarium per five atoms of cobalt. By weight, this magnet alloy will typically contain 36% samarium with the balance cobalt. [9] The energy products of these samarium–cobalt alloys range from 16 MG·Oe to 25 MG·Oe, that is ...
The magnetic field typically produced by rare-earth 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 also vulnerable to corrosion, so they are usually plated or coated to ...
The rare-earth elements (REE), also called the rare-earth metals or rare earths, and sometimes the lanthanides or lanthanoids (although scandium and yttrium, which do not belong to this series, are usually included as rare earths), [1] are a set of 17 nearly indistinguishable lustrous silvery-white soft heavy metals. Compounds containing rare ...
U.S. President Donald Trump on Monday told the Pentagon to find better ways to procure a rare earth magnet used in specialty motors, warning that the nation's defense would suffer without adequate ...
Samarium is a rare earth element with a hardness and density similar to zinc. With a boiling point of 1,794 °C (3,261 °F), samarium is the third most volatile lanthanide after ytterbium and europium and comparable in this respect to lead and barium ; this helps separation of samarium from its ores.
Introduced in 2004, they were similar to the Vintage Noiseless pickups, but Lawrence's research into controlling magnetic eddy currents led him to employ miniaturized samarium cobalt alloy magnets instead of Alnico V. Samarium cobalt is a rare earth magnet that is more powerful than the Alnico V magnets traditionally used in pickup design.
Of the more commonly available magnets, only rare-earth magnets such as neodymium and samarium-cobalt are stronger. Alnico magnets produce magnetic field strength at their poles as high as 1500 gauss (0.15 tesla ), or about 3000 times the strength of Earth's magnetic field .
The saturation remanence and coercivity are figures of merit for hard magnets, although maximum energy product is also commonly quoted. The 1980s saw the development of rare-earth magnets with high energy products but undesirably low Curie temperatures. Since the 1990s new exchange spring hard magnets with high coercivities have been developed ...
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