Magnetically-induced ferroelectricity in the (ND4)2[FeCl5(D2O)] molecular compound.

Abstract:

:The number of magnetoelectric multiferroic materials reported to date is scarce, as magnetic structures that break inversion symmetry and induce an improper ferroelectric polarization typically arise through subtle competition between different magnetic interactions. The (NH4)2[FeCl5(H2O)] compound is a rare case where such improper ferroelectricity has been observed in a molecular material. We have used single crystal and powder neutron diffraction to obtain detailed solutions for the crystal and magnetic structures of (NH4)2[FeCl5(H2O)], from which we determined the mechanism of multiferroicity. From the crystal structure analysis, we observed an order-disorder phase transition related to the ordering of the ammonium counterion. We have determined the magnetic structure below TN, at 2 K and zero magnetic field, which corresponds to a cycloidal spin arrangement with magnetic moments contained in the ac-plane, propagating parallel to the c-axis. The observed ferroelectricity can be explained, from the obtained magnetic structure, via the inverse Dzyaloshinskii-Moriya mechanism.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Alberto Rodríguez-Velamazán J,Fabelo Ó,Millán Á,Campo J,Johnson RD,Chapon L

doi

10.1038/srep14475

subject

Has Abstract

pub_date

2015-09-29 00:00:00

pages

14475

issn

2045-2322

pii

srep14475

journal_volume

5

pub_type

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