Measurement of Stabilization Fields for 180° and 90° Bloch Walls in Iron Single Crystals Containing Solute Nitrogen Atoms

In order to ascertain Néel's prediction stabilization fields were measured for 180° and 90° Bloch walls using iron single crystals containing solute nitrogen atoms. Initial magnetization curves were measured when solute nitrogen atoms were distributed in a uniform or equilibrium state. The observed stabilization field for 180° walls showed a sharp maximum in low induction region and tended to zero for large induction. That for 90° walls, however, didn't show such a maximum but approached asymptotically to a finite value. These results support qualitatively Néel's theory. The coefficient w of the interaction energy between nitrogen atoms and the spontaneous magnetization is found to be 9.0 × 10 −16 erg per atom for solute nitrogen atoms in α‐iron.