Journal
APPLIED PHYSICS LETTERS
Volume 104, Issue 18, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4876451
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- Technology Research Association of Magnetic Materials for High Efficient Motors (MagHEM)
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The coercive field and angular dependence of the coercive field of single-grain Nd2Fe14B permanent magnets are computed using finite element micromagnetics. It is shown that the thickness of surface defects plays a critical role in determining the reversal process. For small defect thicknesses reversal is heavily driven by nucleation, whereas with increasing defect thickness domain wall de-pinning becomes more important. This change results in an observable shift between two well-known behavioral models. A similar trend is observed in experimental measurements of bulk samples, where an Nd-Cu infiltration process has been used to enhance coercivity by modifying the grain boundaries. When account is taken of the imperfect grain alignment of real magnets, the single-grain computed results appears to closely match experimental behaviour. (C) 2014 AIP Publishing LLC.
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