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

Table 2

Measured chemical composition of the occurring phases in magnet A determined by EELS and the magnetic parameters used in the micromagnetic simulations.

Phase	Pr+Nd [at%]	Fe+Co		[T]	A [pJ/m]	[MJ/m^3]
Nd2Fe14B	12.8	87.2	—	1.61^3	7.70^3	4.90^3
-GB	52.3	38.2	9.5	0.65	2.25^4	0.00
-GB	32.6	60.4	7.0	1.08	6.25^4	0.00
(--avr.)^1	42.4	49.3	8.3	0.86	4.00^4	0.00
-GB^2	37.2–48.4	44.5–56.0	0.0–15.2	—	—	—
GBj	31.8	10.9	57.3	0.00	0.00	0.00

average of the chemical composition of the - and -GBs. ²Measured values (EELS) depending on the angle of neighboring Nd-Fe-B grains. ³Reference: [35–37]. ⁴Values of A were calculated with (1).