The Three-Dimensional Depolarization Neutron Beamline at Tsing Hua Open Pool Reactor for the Measurement of Magnetic Domain of a Bulk Material

摘要

We introduce a technique of neutron depolarization measurement to observe interior magnetic domains of magnetic materials. An apparatus of three-dimensional depolarized neutron beam has been setup at W-3 beamport of Tsing Hua Open Pool Reactor. When polarized neutrons pass through a magnetic material, the existence of magnetic domains will alter the direction and magnitude of the polarized neutron vector. This alternation would provide useful information of the average domain size, the averaged strength of the induced field, and the mean square directional cosine of the material.