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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 ...
Samarium–cobalt magnets (chemical formula: SmCo 5), the first family of rare-earth magnets invented, are less used than neodymium magnets because of their higher cost and lower magnetic field strength. However, samarium–cobalt has a higher Curie temperature, creating a niche for these magnets in applications where high field strength is ...
Samarium–cobalt magnets are made from an alloy of samarium and cobalt, known for their high magnetic strength, excellent temperature stability and resistance to demagnetization. [4] They are often used in applications requiring powerful and stable magnets, such as in motors , aerospace , military equipment, and high-temperature environments.
A permanent magnet motor is a type of electric motor that uses permanent magnets for the field excitation and a wound armature. The permanent magnets can either be stationary or rotating; interior or exterior to the armature for a radial flux machine or layered with the armature for an axial flux topology.
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An important use of samarium is samarium–cobalt magnets, which are nominally SmCo 5 or Sm 2 Co 17. [104] They have high permanent magnetization, about 10,000 times that of iron and second only to neodymium magnets. However, samarium magnets resist demagnetization better; they are stable to temperatures above 700 °C (1,292 °F) (cf. 300–400 ...
These magnets are cheaper, lighter, and stronger than samarium–cobalt magnets. However, they are not superior in every aspect, as neodymium-based magnets lose their magnetism at lower temperatures [52] and tend to corrode, [53] while samarium–cobalt magnets do not. [54]
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 .