Static neutron depolarization measurements of ferromagnetic domain structures in a FeSi picture frame crystal

The simple domain structure of a FeSi picture frame crystal (3.5 wt.% Si) has been investigated by means of the neutron depolarization technique. This technique is based on a three-dimensional analysis of the polarization of a polarized neutron beam after transmission through the specimen. The influence of the domain walls and the stray fields around the crystal on the various neutron polarization directions is discussed. By changing the neutron path through the crystal, the spontaneous magnetic induction has been obtained: Bsub(s) = 2.1 Vs/m2. The results of these experiments will be used in time-dependent neutron depolarization measurements. (Auth.)