Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-04-26
Physics
Condensed Matter
Strongly Correlated Electrons
9 pages, 6 figures
Scientific paper
The magnetic structure of multiferroic Ni$_3$V$_2$O$_8$ has been investigated using non-resonant X-ray magnetic scattering. Incident circularly polarized X-rays combined with full polarization analysis of the scattered beam is shown to yield high sensitivity to the components of the cycloidal magnetic order, including their relative phases. New information on the magnetic structure in the ferroelectric phase is obtained, where it is found that the magnetic moments on the "cross-tie" sites are quenched relative to those on the "spine" sites. This implies that the onset of ferroelectricity is associated mainly with spine site magnetic order. We also demonstrate that our technique enables the imaging of multiferroic domains through polarization enhanced topography. This approach is used to image the domains as the sample is cycled by an electric field through its hysteresis loop, revealing the gradual switching of domains without nucleation.
Bergevin F. de
Cava Robert. J.
Fabrizi Federica
Fennell Tom
Kenzelmann Michel
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