Fig. 3: 3D cross-sectional images of the micropillar Nd-Fe-B permanent magnet sample.
a, b Thermally demagnetized state and coercivity state at μ0H = −2.7 T, respectively. White arrows and white circles with crosses indicate the easy axis directions on each plane, and the black lines are the grain boundaries drawn from the corresponding 3D cross-sectional BSE-SEM images. Red, yellow, and blue frames of each image correspond to the cross-sectional planes of (x-y), (y-z), and (x-z), respectively, as schematically shown in c. Thin yellow lines indicate the intersections of the (x-y), (y-z), and (x-z) planes. The color bar indicates the normalized magnetization m. The scale bar is 5 μm.
