Abstract
Neutron diffraction from magnetic spiral structures is governed by strong selection rules for the polarization of the outgoing beam. When the sample is entirely of one chirality – for instance a right-handed spiral – the neutrons diffracted by some Bragg reflections are fully polarized. While the scattering theory has been formulated long ago, attempts to controllably modify the population of left-handed and right-handed spiral domains in natural magnetic structures (which for instance occur in some rare-earth metals) have been largely unsuccessful. In contrast, we have been able to imprint helical magnetic structures in La/Fe multilayers (each layer approximately 30 Å thick) simply by rotating the growing sample in a weak external field (3 Oe). A first estimate is given of the efficiency of these multilayers as polarizers of neutron beams.
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