X-ray magnetic tomography measurements were performed on an advanced high-coercivity Nd-Fe-B permanent magnet, and three-dimensional (3D) magnetic domain structure was successfully obtained along the magnetic hysteresis curve. Furthermore, scanning electron tomography measurement was adopted to obtain 3D microstructure for the same observing volume. By comparing these two types of 3D images, we found various critical behaviors of magnetic domains inside the magnet, which are essential to understand the microscopic coercivity mechanism of permanent magnets.
- Makoto Takeuchi
- Motohiro Suzuki
- Satoshi Okamoto