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Advances in Materials Research Volume 4, Number 4, December 2015 , pages 227-233 DOI: https://doi.org/10.12989/amr.2015.4.4.227 |
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Strategic coating of NdFeB magnets with Dy to improve the coercivity of permanent magnets |
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Huseyin Ucar, David S. Parker, I.C. Nlebedim, R.W. McCallum, S.K. McCall and M. Parans Paranthaman
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| Abstract | ||
| We present a method, supported by theoretical analysis, for optimizing the usage of the critical rare earth element dysprosium in Nd2Fe14B (NdFeB)-based permanent magnets. In this method, we use Dy selectively in locations such as magnet edges and faces, where demagnetization factors are largest, rather than uniformly throughout the bulk sample. A 200 nm thick Dy film was sputtered onto a commercial N-38, NdFeB magnets with a thickness of 3 mm and post-annealed at temperatures from 600-700 | ||
| Key Words | ||
| NdFeB magnets; sputter deposition; selective Dy diffusion; magnetic properties; theoretical analysis | ||
| Address | ||
| Huseyin Ucar, David S. Parker and M. Parans Paranthaman: Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA I.C. Nlebedim, R.W. McCallum: Ames Laboratory, Ames, Iowa 50011, USA S.K. McCall: Lawrence Livermore National Laboratory, Livermore, California 94550, USA | ||
