Blochwand-Verhalten von Nickeleisenschichten unter Einwirkung steiler Feldimpulse. Wandflattern als Folge der Präzession der Wandmagnetisierung um das Impulsfeld. Randstreufelder.

The Bloch wall streaming in evaporated anisotropic 81/19 Ni-Fe films between 150 and 240 nm thick is shown. It has been made visible by means of the Kerr magnetooptic effect. Wall streaming is observed in case a pulse field with a rise time smaller than 20 ns is applied along the hard axis. It consists of small wall steps induced by the gyromagnetic precession of the wall center spins around the rising pulse field. It is, therefore, an impressive demonstration of the connection between the magnetization and the electronic spin. The following topics are shown: 1. Wall streaming including the domain nucleation at the films edge, in a film of 2 mm diameter for different pulse amplitudes. 2. Wall streaming in the central part (nearly not influenced by edge stray fields) of a film of 4 mm diameter, for different pulse amplitudes. 3. Wall streaming in a pulse field of especially low repetition rate (1 instead of 4 pulses per picture frame) for one pulse amplitude.