How does temperature affect the behavior of a permanent magnet?
Curie Temperature (Tc): This is the temperature at which a magnet material loses it’s strength, permanently. Another useful number (if available) is Tmax, the recommended maximum operating temperature. Above Tmax (around 266 deg. F for most NdFeB magnets) a magnet will start ot lose its power, and at Tc all power is lost. If you need strong magnets that can be used at high temperatures, consider using Samarium Cobalt (SmCo) magnets. • Will magnets corrode if used outdoors? NdFeB magnets are susceptible to corrosion. The ‘Fe’ in the name stands for Iron, and it rusts! Many of our magnets come with a Nickel, Zinc, Gold or Epoxy coating to protect them from moisture. If the coating is damaged (frequently the case with surplus magnets) the magnet could rust if exposed to water or humidity. If this is a concern to you, you can easily add another layer of protection by dipping the magnet in epoxy or plastic coating. • I’ve read about patent problems concerning NdFeB magnets. Are your magnets
Ferromagnetic materials heated above a certain temperature, known as the Curie Temperature or Curie point, completely lose their ferromagnetic behavior. The magnetic domains within the magnet are actually generated when the material cools below the Curie point. The Curie temperature for Neodymium magnets is roughly 590 F. Actually, the ferromagnetic properties of a material can change for temperatures well below the Curie temperature. Neodymium magnets, for example, begin to lose their magnetization at temperatures as low as 300 F. • What are Neodymium magnets made of? Not just Neodymium! Neodymium itself is actually a element number 60 on the periodic table. Neodymium magnets are actually made up of a compound called NIB, for Neodymium Iron Boron (Nd2Fe14B). This compound is one of the strongest known ferromagnetic materials.Click here for more information about the element Neodymium. • How can I make a magnet levitate? Check out our Diamagnetic Levitation pages! • Are your magnets gr
