Rare earth magnets are strong alloy magnets which were developed in the late 70’s. The remanence of the magnet is an important factor to examine when buying. Unlike ceramic or ferrite magnets, rare earth have stronger strength, up to 1.4 teslas. Secondly, attention must be of concern toward the coercivity; the resistance to demagnetization of a magnet when shopping buying any magnet. In addition, the Curie temperature should also be assessed so as to maximize performance. The higher the remanence, the higher the coercivity becomes low curie temperatures making the magnetic field stronger than other types available. Although they are termed as rare earth style magnets, these magnets are found as abundantly as lead or tin naturally.
Rare earth are exceptionally brittle and most susceptible to corrosion, a flaw which is corrected by coating so as to protect them against breakage or chipping. Two main types are dominant in the market; neodymium and samarium-cobalt which vary mostly by their curie temperature. Neodymium is the strongest and most affordable type of magnet and a trusted component in electric motors, computer hard drives manufacture and jewelry clasps. Additionally, electric appliances such as headphones, power steering systems for vehicles in a commercial magnitude. However, neodymium have low Curie temperature and more prone to oxidation than samarium-cobalt. On the other hand, samarium-cobalt were invented first and are much costlier and have weaker magnetic field than neodymium. The high Curie temperature in samarium-cobalt make them ideal for manufacturing at high temperatures.
The magnetic strength indicates the magnet. Generally, higher numbers shows that a magnet is strong. The numbers originate from an existing property in the material and are often expressed in terms of Mega Gauss Oersteds, representing a magnet’s strongest point on the demagnetization curve. For instance a magnet grade of N52 has a strong pull force depending on the application at room temperature. Basically, doubling the N number means double the magnetic strength. Thinner shapes of magnets may have stronger pull at ambient room temperature. The atoms retain a magnetic moment which is quite high in the solid state as a result of filling up the f-shell harboring up to seven electrons with associated swirls.
magnets exhibit some hazards rarely observed with other types of magnets. Injuries which may include broken bones may be afflicted by magnets even if only a few centimeters big. Two magnets coming into sudden contact too may break and shatter to pieces that may injure the people around, especially young children who may swallow the chipped pieces of rare earth magnet to cause immediate death.