Magnetic stray fields of iron-whiskers with Landau-structure

The normal component of the stray field of iron-whiskers was measured using a high resolving Vibrating-Pickup Loop Magnetometer. The scanning tracks are parallel to the surface at a distance of about 2 μm. The stray field is registered as a function of the locus by an XY-recorder. Using the Kerr-technique, we find a Landau structure up to 3.4 kA/m. Complex structures were observed in high magnetic fields. The plot of the stray field is independent of the domain configuration and it is characterized by a shape similar to that of the stray field of single permalloy bars /1/. The origin of the stray fields of the whiskers is discussed.