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http://dx.doi.org/10.4283/JKMS.2012.22.6.221

Current Status and Research Trend of Rare-earth Permanent Magnet  

NamKung, Seok (LG Electronics)
Cho, Sang-Geun (LG Electronics)
Kim, JinBae (LG Electronics)
Publication Information
Journal of the Korean Magnetics Society / v.22, no.6, 2012 , pp. 221-227 More about this Journal
Abstract
High performance permanent magnets have become the subject of considerable attention because of the potential applications in the traction motors of hybrid and electric vehicles and wind generators. Nd-Fe-B magnets have attracted considerable interest due to a large maximum energy product. However, Nd-Fe-B magnet cannot be used in high temperature (${\sim}200^{\circ}C$) applications due to the thermal degradation of coercivity. Therefore, the development of high coercivity Nd-Fe-B permanent magnet is a challenging issue. In case of high coercivity Nd-Fe-B permanent magnet, an increment in the intrinsic coercivity can be easily achieved by substituting Nd atoms with Dy or Tb atoms. However, these heavy rare-earth elements are known to cause a decrease in remanence due to the antiferromagnetic coupling between Dy and Fe atoms. In addition, Dy is relatively expensive and being limited in quantity. Hence, a new technology that can increase the coercivity of Nd-Fe-B sintered magnet using only a small amount, or even, no amount of heavy rare-earth elements is being investigated. This article describes the research trend in reducing the heavy rare-earth elements in Nd-Fe-B magnets.
Keywords
Nd-Fe-B; permanent magnets; coercivity; rare-earth;
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