Magnetic domain walls have been studied in micrometer-sized ${\mathrm{Fe}}_{20}{\mathrm{Ni}}_{80}$ elements containing geometrical constrictions by spin-polarized scanning electron microscopy and numerical simulations. By controlling the constriction dimensions, the wall width can be tailored and the wall type modified. In particular, the width of a ${180}^{°}$ Néel wall can be strongly reduced or increased by the constriction geometry compared with the wall in unconstrained systems.

• Received 23 April 2004

DOI:https://doi.org/10.1103/PhysRevB.69.220410