Diffraction of cold neutrons at ferromagnetic Bloch walls. Elastic scattering

The traditional methods of studying domain structure primarily give information on the structure of the specimen surface. Neutron diffraction techniques еnаЫе one to "illuminate" the ferromagnetic domains, and to investigate their structure in thick specimens. The elastic scattering cross section of cold neutrons scattered bу а plane-parallel domain structure is obtained taking into account the internal structure of the ferromagnetic Bloch walls. The experimental method is discussed. It is shown that for the majority of materials а diffraction pattern can only bе observed for а structures period 1 ≤ I0^{-5} cm.