What question did this study set out to answer?

To enhance the coercivity of Nd-Fe-B magnets beyond thickness limits through a new bonding-diffusion process.

Overcoming Thickness Limits in Grain Boundary Diffusion Magnets via a Bonding‐Diffusion Process

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A scalable bonding-diffusion process enhances coercivity in thick magnets, suggesting effectiveness in high-power applications.

To enhance the coercivity of Nd-Fe-B magnets beyond thickness limits through a new bonding-diffusion process.
Proposed a terbium hydride-assisted bonding-diffusion process
Utilized spray coating and stacking for magnet assembly
Performed electron probe microanalysis and transmission electron microscopy
Conducted micromagnetic simulations for mechanism clarification
Achieved a coercivity increase to 27.20 kOe in a 15 mm-thick magnet assembly
Confirmed formation of a rare-earth-rich bonding interface and core-shell structures
Demonstrated improved shear strength of the magnets

Zhang et al. (2026) studied this question.

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