| Abstract: | We prepared thin single crystal foils of 50 Ni 50 Fe for observation in a 100 kV electron microscope. Due to its high saturation induction and low anisotropy, magnetic domain walls can be easily observed in this material. The effective anisotropy which governs the wall angles consists of crystal anisotropy and superimposed random stress anistropies so that wall angles of any magnitude are found.In accordance with theory three distinct wall types are identified for film thickness between 500 Å and 2000 Å as a function of wall angle θ: (i) the asymmetric Bloch wall for 180° θ #62; 140°, (ii) the asymmetric Néel wall for 140° #62; θ #62; θs, and (iii) the symmetric Néel wall for θs #62; θ, where θs is an angle which decreases with increasing film thickness. |
