Spiral magnetic structure of Fe in Van der Waals gapped FeOCl and polyaniline-intercalated FeOCl

S. R. Hwang, W. H. Li, K. C. Lee, J. W. Lynn, C. G. Wu

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37 Scopus citations

Abstract

High-resolution and magnetic neutron-diffraction measurements were performed to investigate the crystal and magnetic structures of bilayered FeOCl and polyaniline-intercalated FeOCl. A quasi-two-dimensional crystallographic structure, where charge neutral (Fe2O2Cl2)n lamellas are weakly linked via Van der Waals interactions, has made FeOCl a good host for accommodating guest molecules. A three-dimensional long-range ordering of the Fe spins in FeOCl develops below 80 K, with a magnetic unit cell 28 times the size of the nuclear one. A spiral magnetic structure was obtained, reflecting the competition between antiferromagnetic superexchange coupling and ferromagnetic direct exchange coupling. Polyaniline intercalation interrupts the magnetic correlations between the neighboring bilayers, rendering a coupled-bilayer quasi-two-dimensional magnetic order for the Fe spins in (C6D4ND)0.16FeOCl. No significant change on the ordering temperature of the Fe spins by the intercalation reaction was observed.

Original languageEnglish
Pages (from-to)14157-14163
Number of pages7
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume62
Issue number21
DOIs
StatePublished - 1 Dec 2000

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