Neutron Scattering

is also named magnetic form factor . If the spin density distribution is delocalised as e .g . for
3d-elements, the magnetic form factor decays even more strongly than the X-ray analogue .
2 .8 Conclusion : Why are neutrons interesting?
Modem materials research together with the traditional scientifc interest in the understanding
of condensed matter at the atomic scale requires a complete knowledge of the arrangement
and the dynamcs of the atours or molecules and of their magnetic properties as well. This
information can be obtained by investigating the interaction of the material in question with
varies kinds of radiation such as visible light, X-rays or synchrotron radiation, electrons, ions
and neutrons . Among them, neutrons play a unique role due to the inherent properties
discussed above
" their dynamic dipole moment allows the investigations of the magnetic properties of
materials .
" their large mass leads to a simultaneous sensitivity to the spatial and temporal scales that
are characteristic of atomic distances and motions .
" neutrons interact differently with different isotopes of the saure atomic species . This
allows the experimentator to paint selected atoms or molecules by isotopes replacement.
" neutrons can easily penetrate a thick material - an important advantage for material
testing .
" the interaction of the neutron with a nucleus bas a simple form (Born approximation)
which facilitates the direct unambiguous theoretical interpretation of experimental data .