The measurement of narrow domain-wall widths in SmCo5 using differential phase contrast electron microscopy

Differential phase contrast imaging in a scanning transmission electron microscope has been used to measure very narrow domain walls in the ferromagnetic alloy SmCo5. This technique provides a more accurate and direct measurement of domain‐wall structure than is possible with more conventional methods, and has allowed, for the first time, an experimental test of the predicted wall widths in highly anisotropic material.