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Press Release

World's First Heat-Resistant Magnet Containing Less Neodymium and Zero Dysprosium Developed

– Maintains heat resistance while reducing neodymium content by up to 50% –
February  20,2018
New Energy and Industrial Technology Development Organization (NEDO)
Technology Research Association of Magnetic Materials for High-Efficiency Motors (MagHEM)

As part of a NEDO project, Toyota Motor Corporation, which is a member of the Technology Research Association of Magnetic Materials for High-Efficiency Motors (MagHEM), has developed the world's first neodymium-reduced, heat-resistant magnet.

Neodymium magnets are used in various types of motors such as the high-output motors found in electrified vehicles, use of which is expected to increase rapidly in the future. The new magnet uses significantly less neodymium, a rare-earth element ("rare earth"), and can be used in high-temperature conditions.

The newly developed magnet uses no terbium (Tb) or dysprosium (Dy), which are rare earths that are also categorized as critical materials necessary for highly heat-resistant neodymium magnets. A portion of the neodymium has been replaced with lanthanum (La) and cerium (Ce), which are low-cost rare earths, reducing the amount of neodymium used in the magnet.

Neodymium plays an important role in maintaining high coercivity (the ability to maintain magnetization) and heat resistance. Merely reducing the amount of neodymium and replacing it with lanthanum and cerium results in a decline in motor performance. Accordingly, Toyota adopted new technologies that suppress the deterioration of coercivity and heat resistance, even when neodymium is replaced with lanthanum and cerium, and developed a magnet that has equivalent levels of heat resistance as earlier neodymium magnets, while reducing the amount of neodymium used by up to 50 percent.

This new type of magnet is expected to be useful in expanding use of motors in various areas such as automobiles and robotics, as well as maintaining a balance between the supply and demand of valuable rare earth resources.

For more information, please contact:

NEDO Materials Technology and Nanotechnology Department
Contact Persons: Watanabe, Sakai, Kohda Tel: +81-44-520-5220­

Technology Research Association of Magnetic Materials for High-Efficiency Motors (MagHEM)
Contact Person: Sakuta Tel: +81-3-3592-0189­