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Advances in Materials Research
  Volume 4, Number 4, December 2015, pages 227-233

Strategic coating of NdFeB magnets with Dy to improve the coercivity of permanent magnets
Huseyin Ucar, David S. Parker, I.C. Nlebedim, R.W. McCallum, S.K. McCall and M. Parans Paranthaman

Abstract     [Full Text]
    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
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

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