UPDATE : 2017-09-05
(SmCo) magnet, a type of rare earth magnet, is a strong permanent
magnet made of an alloy of samarium and cobalt. They
are generally ranked similarly in strength to neodymium magnets, but
have higher temperature ratings and higher coercivity. They are brittle,
and prone to cracking and chipping. Samarium–cobalt magnets have maximum energy
products (BHmax) that range from 16 megagauss-oersteds (MG·Oe) to 33
MG·Oe, that is approx. 128 kJ/m3 to 264 kJ/m3; their theoretical limit is
34 MG·Oe, about 272 kJ/m3. They are available in two "series", namely
Series 1:5 and Series 2:17.
Samarium Cobalt magnets exhibit magnetic anisotropy, meaning they can only
be magnetized in the axis of their magnetic orientation. This is done by
aligning the crystal structure of the material during the manufacturing process.