Distribution of Magnetic Moment in Hexagonal Cobalt

The magnetic form factor of hexagonal cobalt has been determined by measuring the coherent scattering of a polarized neutron beam from single-crystal samples. A Fourier inversion of the data indicates a nearly spherical distribution of positive moment around each atom, decreasing to a negative level in the space between atoms. A comparison of the results with calculated free-atom form factors shows that the observations can be accurately described by a model in which the net spin density is given by the sum of a positive free-atom $3d$ distribution and a negative constant. In terms of this model, the total moment per atom is composed of the following parts: $3d$ spin, + 1.86\ifmmode\pm\else\textpm\fi{}0.07 \ensuremath{\mu}\ensuremath{\beta}; $3d$ orbital, + 0.13\ifmmode\pm\else\textpm\fi{}0.01 \ensuremath{\mu}\ensuremath{\beta}; constant spin, -0.28 \ifmmode\pm\else\textpm\fi{}0.07\ensuremath{\mu}\ensuremath{\beta}. The form factor showed no dependence on temperature between 78 and 300\ifmmode^\circ\else\textdegree\fi{}K.

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