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PACS 75.50.Tt -Fine-particle systems; nanocrystalline materials PACS 75.25.+z -Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source X-ray scattering, etc.) PACS 61.05.fg -Neutron scattering (including small-angle scattering)Abstract -We report magnetization and magnetic neutron scattering measurements on nanocrystalline Fe which was prepared by means of the inert-gas condensation technique. Depending on the compaction pressure applied during the synthesis procedure (0.5-1.8 GPa), the resulting Fe samples contain porosity with volume fractions between about 20-35%. We provide evidence that the spin disorder which is associated with porosity has a strong influence on magnetic properties, and it gives rise to a characteristic clover-leaf-shaped angular anisotropy in the elasticmagnetic-scattering cross-section.

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