Enhanced magnetic properties of anisotropic Nd-Fe-B nanocomposites by Fe（C）coating

Fengqing Wang¹，Guiping Tang¹，Baoru Bian¹，Lulu Yao¹，Qiang Zheng³，Juan Du¹

1. CAS Key Laboratory of Magnetic Materials and Devices,Ningbo Institute of Material Technology and Engineering,Chinese Academy of Sciences (CAS)3. School of Materials and Chemical Engineering,Ningbo University of Technology

摘 要：Nanostructured anisotropic Nd-Fe-B/Fe（C） composite powders were prepared by coating Fe（C） softmagnetic nanoparticles on HDDR Nd-Fe-B hard magnetic powders using iron pentacarbonyl Fe（CO）₅ as soft-phase precursor.The effect of Fe（CO）₅-loading amount on soft-phase purity,coating morphology and magnetic properties of the composite powders was investigated.Dense and continuous Fe（C） softphase coatings with average particle sizes of 58-68 nm are obtained at Fe（CO）₅ loading amounts of x <12 wt%,leading to enhanced remanence and improved energy product of the coated powders.Positive value in δM-plots and single-phase-like demagnetization curves are observed in the Nd-Fe-B/Fe（C） composite powders,indicating the exchange coupling effect between the coated Fe（C） soft phases and the Nd-Fe-B hard phase.

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