SmCo is the short form of the samarium–cobalt magnet. As the name suggests, the magnet is produced from an alloy that contains samarium and cobalt. It belongs to the category of the rare earth magnet, meaning it is also a powerful and sturdy permanent magnet.

SmCo Magnet is usually ranked in the same way to the strength of a neodymium magnet. However, these magnets have higher coercivity and temperature ratings when compared to those of Neodymium magnet. They are fragile and prone to chipping and cracking. A Samarium–cobalt magnet will have the highest energy products, ranging from 16 to 20 megagauss-oersteds and with the theoretical limit of 34 megagauss-oersteds. SmCo Magnets are available in two different series, such as Series 2:17 and Series 1:5.

The alloys of the Series 2:17 magnets will have the greatest reversible temperature coefficient than other rare-earth magnetic alloys, including the Series 1:5 versions.

The Series 2:15 magnets can be easily calibrated to a precise magnetic field when compared to 2:17 series magnets.

Sintered SmCo magnets show magnetic anisotropy. This means that they can be magnetized in the alliance of their magnetic course. This can be done by means of aligning the crystal arrangement of the substance during the process of manufacturing.

Samarium–cobalt magnets have superior temperature stability, resistance to diamagnetism, but costly.

Coated Neodymium magnets also come under the category of the rare-earth magnet and they are the most extensively used magnets, as well. This means that they are also permanent magnets, but they are constructed from an alloy of iron, neodymium, and boron to form the tetragon-shaped crystalline structure. These magnets are considered the most powerful and sturdiest type of permanent magnets.

Neodymium magnets have changed other categories of magnets in numerous applications in contemporary products, such as disk drives, cordless tools motors, and magnetic clasps, as they need sturdy permanent magnets.


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