Visualization of magnetic fields in magnetic materials by polarized pulsed neutrons

Visualization of magnetic fields is a very attractive application for the neutron imaging technique. In this technique, the change of the neutron polarization due to the Larmor precession in a passage through a magnetic field can be projected in a two-dimensional image. Moreover, as the interaction between magnetic fields and a neutron spin depends on the neutron wavelength, analysis of the wavelength dependent polarization makes it possible to quantify the both magnetic field strength and direction. Hence, the combination of Time-of-flight method of pulsed neutron beam and three-dimensional polarization analysis is very suitable to the neutron magnetic field imaging technique. In this article, we will explain about the results on magnetic sample. (author)