Why Samarium Cobalt and Neodymium Magnets are Called "Rare Earth" Magnets?

27 Jun 2018  11:28:04,
Abstract: There are seventeen rare earth elements– fifteen of which are lanthanides and two of which are transition metals, yttrium, and scandium found with lanthanides and are chemically similar. Samarium (Sm) and Neodymium (Nd) are the two most commonly used rare earth elements in magnetic applications. More specifically, samarium and neodymium are light rare earth elements (LREE) in the cerium earth group. Samarium cobalt and neodymium alloy magnets provide some of the best force-to-weight ratios for industrial and commercial applications.
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