A Combined TEM/STEM and Micromagnetic Study of the Anisotropic Nature of Grain Boundaries and Coercivity in Nd-Fe-B Magnets

Figure 3

(a) 8-G finite element model structure consisting of 8 Nd-Fe-B grains (50 nm edge, 2 nm mesh size) misaligned by and separated by 6 nm thick - and -GBs (2 nm mesh size); (b) cut of the 8-G-GBj model structure with a truncated octahedron GBj with a height of 44 nm in the center of the model structure; (c) cut of the 27-G-GBj model structure consisting of 27 grains (30 nm edge, 2 nm mesh size) separated by 4 nm thick - and -GB and GBj and grain boundary edges.

(a)

(b)

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