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<p>This study focuses on increasing the magnetic properties by adding elemental Dy directly during arc-melting and investigating its effects on phase formation behavior, magnetic properties and microstructural refinement. Whereas, a majority of previous studies examining the effect of Dy addition in Nd–Fe–B show that Dysprosium (Dy) is added via the Grain Boundary-Diffusion-Process. Ribbons of composition Nd<sub>2-x</sub>Dy<sub>x</sub>Fe<sub>14</sub>B (x = 0, 0.2, 0.4, 0.6) were synthesized, at a wheel speed of 30&#xa0;m/s. The XRD technique was used to study the phase formation behavior and the distribution of various phase fractions. DFT calculations were performed to theoretically estimate the magnetic properties of the various phases and categorize them into soft and hard magnetic phases. Magnetic properties, measured by SQUID magnetometer, revealed that Dy addition increased the Maximum Energy product by two-fold while the coercivity value increased 4 times without compromising the saturation and remanence. Dy addition increases coercivity via microstructural refinement without reducing remanence due to strong intergranular exchange coupling.</p> Graphical abstract <p></p>

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Enhancement of magnetic efficiency of exchange-coupled isotropic Nd2-xDyxFe14B melt-spun ribbons: First principle DFT calculations and experimental approach

  • 期刊论文

  • 发表日期：

    2026年3月11日

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  • Shrantik Kumar Dey,
  • Akash Oraon,
  • Tapasendra Adhikary,
  • Gautam Sinha,
  • Suchit Sarin,
  • Jeffrey E. Shield,
  • Shampa Aich

摘要

This study focuses on increasing the magnetic properties by adding elemental Dy directly during arc-melting and investigating its effects on phase formation behavior, magnetic properties and microstructural refinement. Whereas, a majority of previous studies examining the effect of Dy addition in Nd–Fe–B show that Dysprosium (Dy) is added via the Grain Boundary-Diffusion-Process. Ribbons of composition Nd2-xDyxFe14B (x = 0, 0.2, 0.4, 0.6) were synthesized, at a wheel speed of 30 m/s. The XRD technique was used to study the phase formation behavior and the distribution of various phase fractions. DFT calculations were performed to theoretically estimate the magnetic properties of the various phases and categorize them into soft and hard magnetic phases. Magnetic properties, measured by SQUID magnetometer, revealed that Dy addition increased the Maximum Energy product by two-fold while the coercivity value increased 4 times without compromising the saturation and remanence. Dy addition increases coercivity via microstructural refinement without reducing remanence due to strong intergranular exchange coupling.

Graphical abstract