The Samarium–cobalt magnet is easy to peel. When handling them, goggles must be worn.

Hitting magnets together may cause them to shatter, which may lead to potential hazards.

Samarium cobalt manufacturing is made by a process called sintering, which involves sintering all materials, and internal cracks are highly likely to occur. Magnets do not have mechanical integrity and only have the function of preparing magnetic fields. Therefore, it is necessary to design special mechanical systems to give the overall system sufficient mechanical reliability

Very good coercivity.

Good temperature stability (maximum operating temperature from 250 to 550 ℃, Curie temperature from 700 to 800 ℃).

The price is expensive and susceptible to price fluctuations (cobalt market price sensitivity).