Stanford Magnets

Things You Should Learn About Neodymium Magnets

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Courtesy of Stanford Magnets

A neodymium magnet boasts many applications in various industries. It is currently the leading permanent magnet on earth. Without this magnet the world would put pressure on scientists to find a matching alternative. But this is unlikely to happen any time soon as China mines ninety-seven percent of world’s neodymium. Perhaps more mines will be re-opened in the US, as neodymium magnets are things the world cannot do without now. Though Samarium Cobalt is also a rare earth magnet, it is not as powerful as neodymium in terms of the magnetic field. SmCo only outdoes Neodymium when it comes to Curie temperature and resistance to oxidation.

Also called NdFeB, Neo or NIB magnet, neodymium is made of the world’s strongest metals. These include neodymium, iron and boron (NIB) and chemically presented as Nd2Fe14B. It is an alloy of the above three metals and does not appear in any other form. If NdFeB and SmCo were to be heated at the same time, the former would perform well at up to +150 degrees Celsius. The latter would outdo the former from between +130 to +160 degrees Celcius. In other words, SmCo performs better when heated above +150 degrees Celsius. Even though neodymium magnets lose their strength as Curie temperature is approached, they are the best in small volume applications.

Furthermore, their coercivity is high and so they cannot easily lose their magnetism. They also exhibit a high Maximum Energy Product. The information mentioned above about NIB behavior when exposed to temperature is general. Thus a customer can expect slight variations with Neodymium grades. Some grades can withstand up to +200 to +230 degrees Celsius-optimum recommended range. Beyond this temperature range such magnets are likely to lose their magnetism. The magnet shape and magnetic circuit it is exposed to can highly determine its ability to retain its magnetism. Neo magnets can be found in varied shapes, including bar, block, arc, ring, disc, rod, pot, tube and ball among others. Prior to ordering, one should find out their project requirements. Will it require a block or an arc or both? If a customer cannot find enough information on a particular shape, they should inquire from the manufacturers.

Since neodymium magnets are known to rust easily, because of the Iron atoms in them, they are coated or plated. So as a customer does their shopping, they must pay attention to this detail. Many internet shops sell Ni-Cu-Ni NIB magnets. These feature a triple layer plating of nickel, copper and nickel.

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