Department of Physics Papers

Document Type

Journal Article

Date of this Version

12-19-2008

Publication Source

Physical Review B

Volume

78

Start Page

245115-1

Last Page

245115-10

DOI

10.1103/PhysRevB.78.245115

Abstract

By combining neutron four-circle diffraction and polarized neutron-diffraction techniques we have determined the complex spin structures of a multiferroic YMn2O5 that exhibits two ferroelectric phases at low temperatures. The obtained magnetic structure has spiral components in both the low-temperature ferroelectric phases that are magnetically commensurate and incommensurate, respectively. Among proposed microscopic theories for the magnetoelectric coupling, our results are consistent with both the spin-current mechanism and the magnetostriction mechanism. Our results also explain why the electric polarization changes at the low-temperature commensurate-to-incommensurate phase transition.

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Date Posted: 20 August 2015

This document has been peer reviewed.