Modeling of Nd-Oxide Grain Boundary Phases in Nd-Fe-B Sintered Magnets

G. Hrkac, K. Butler, T.G. Woodcock, L. Saharan, T. Schrefl, O. Gutfleisch

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Abstract

We use atomistic and micromagnetic simulations combined with atomic-scale, aberration-corrected transmission electron microscopy to study the anisotropy profile of the interface between a Nd2O3-hP5 and a Nd2Fe14B phase. It is shown that a hybrid Morse-Buckingham potential approach can be used to study mixed-metallic and oxide-rich systems and to calculate surface-energy-induced large strains and potentially large relaxation effects on the adjacent grains. These are used to derive a magnetoelastic anisotropy energy from a first-order perturbation of the magnetoelastic Hamiltonian and are used to evaluate its effect on coercivity. It is shown that the change in coercivity originates from these distortions in the Nd2Fe14B crystal lattice close to the grain boundary, and the coercivity can be evaluated using such a multiscale modeling approach.

Original languageEnglish
Pages (from-to)1138-1143
JournalJOM
Volume66
Issue number7
DOIs
Publication statusPublished - Jul 2014

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    Hrkac, G., Butler, K., Woodcock, T. G., Saharan, L., Schrefl, T., & Gutfleisch, O. (2014). Modeling of Nd-Oxide Grain Boundary Phases in Nd-Fe-B Sintered Magnets. JOM, 66(7), 1138-1143. https://doi.org/10.1007/s11837-014-0980-5