A Magnet is a that what attracts or repels the ferromagnetic materials. One of the good example of the Ferromagnetic material is iron. Commonly there are four types of permanent magnet
The Neodymium and Samarium Cobalt are strong rare earth magnets made of alloys of rare earth elements. They have a wide application as they can retain the magnetic field for a very long time.
What are Rare Earth Magnets?Back to Top
The rare earth magnets are the metals that are ferromagnetic in nature. They get magnetized permanently as their Curie temperature will be below room temperature so in pure form their magnetism appears at low temperature. They form compounds with the transition metals such as iron, nickel and cobalt. Some of these have a Curie temperature above room temperature. The special thing about them is that they have a great attractive power. Commonly used rare earth magnets are Neodymium and Samarium Cobalt.
Hence, the rare earth magnets are
- Come under lathanoid series in periodic table
- Strong permanent magnets
- Have high Coercivity
- Have high magnet anisotropy.
How are Rare Earth Magnets made?Back to Top
Neodymium magnets are composed as an alloy of neodymium (Nd), iron (Fe) and boron (B) that is (NdFeB) while samarium cobalt are made of samarium (Sm), Cobalt (Co), Copper (Cu) and Zirconium (Zr). Unlike Neodymium these can resist their property even for high temperature and hence have a higher Curie point (working temperature of Neodymium is 120o C and for Samarium Cobalt is 250o C).