Abstract
Abstract : By using the neutron as a probe, precise information can be obtained about the spatial distribution of the magnetic moment density in a ferromagnet that is quite free of theoretical approximations. By comparison of the measured form factors with free atom form factors, and by direct calculation of the magnetic moment density from the measured neutron data, it was found that the magnetic moment distribution in iron and cobalt agreed with a model of the magnetization that imposed free atom-like distributions on a constant negative background. It was also discovered that the magnetic moment density was quite asymmetric about the nuclei in iron but almost spherical in cobalt. It was apparent that it would be valuable to know distribution of the magnetic moment density in nickel so that it could be compared with that of iron and cobalt. The magnetic scattering amplitude for nickel was determined for the first 27 Bragg reflections. The magnetic form factor was Fourier transformed to give a three-dimensional map of the magnetic moment density directly from the measured data. The map shows clearly the asymmetry in the magnetic moment distribution.
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