Magnetic structure of the field-induced multiferroic GdFe3(BO3)4

Details Magnetic structure of the field-induced multiferroic GdFe3(BO3)4 Magnetic structure of the field-induced multiferroic GdFe3(BO3)4

2008-11-20

arxiv.org/abs/0811.3369v1

Physics

Condensed Matter

Strongly Correlated Electrons

27 pages, 7 figures, to appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.78.214407

We report a magnetic x-ray scattering study of the field-induced multiferroic GdFe3(BO3)4. Resonant x-ray magnetic scattering at the Gd LII,III edges indicates that the Gd moments order at TN ~ 37 K. The magnetic structure is incommensurate below TN, with the incommensurability decreasing monotonically with decreasing temperature until a transition to a commensurate magnetic phase is observed at T ~ 10 K. Both the Gd and Fe moments undergo a spin reorientation transition at TSR ~ 9 K such that the moments are oriented along the crystallographic c axis at low temperatures. With magnetic field applied along the a axis, our measurements suggest that the field-induced polarization phase has a commensurate magnetic structure with Gd moments rotated ~45 degrees toward the basal plane, which is similar to the magnetic structure of the Gd subsystem observed in zero field between 9 and 10 K, and the Fe subsystem has a ferromagnetic component in the basal plane.

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