Rare earth magnets are the strongest type of permanent magnet currently made. They are composed of neodymium iron boron magnetic material and are plated in nickel-copper-nickel for a shiny corrosion resistant finish. They are magnetized through the thickness. They are can customizzed sizeand have innumerable uses. 
Characteristics & application of SmCo permanent magnet
1. SmCo permanent magnet has high magnetic energy product and high cercive force. Its properties are better than AINiCo, ferrite permanent magnet. Its max energy product is up to 239kJ/m3(30MGOe), which is three times of that of AINiCo8 permanent magnet, eight times of that of ferrite permanent magnet(Y40). So the permanent magnetic component made from SmCo material is small, light and stable in property. It is widely applied to electro acoustic & telecommunication apparatus, electric motors, measure meters, peg-top, electronic watch, microwave apparatus, magnetic mechanism, sensor and other static or dynamic magnetic routes.
2.The curie temp. of the SmCo permanent magnet is high and its temp. Coeff is low. So it is suitable for use at 300 high temp.
3.SmCo permanent magnet is hear and bristle. Its rigidity strength, tensile strength and press strength are low. So it is not suitable for framework.
4.The main ingredient of SmCo permanent magnet is metal cobalt (CY99.95%). So its price is high.