Magnetic correlations in alumite studied by neutron depolarisation

A polarized neutron beam ( lambda =0.36 nm) was transmitted both perpendicularly and at skew angles through alumite films of various geometries. Three-dimensional depolarization analysis was performed. A model containing the geometry of the needles in the alumite and a parameter K for the excess correlation between their magnetic moments over the reduced magnetization is applied to describe the data. It appears that K becomes more negative as the magnetic interaction between the needles increases.<
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