Tuesday, July 26, 2011, 9:00 am — Seminar Room, Bldg. 725
Multiferroics are materials with more than one type of ferroic order, and have attracted recent interest due to potential device applications. Multiferroic rare earth ferroborates, RFe3(BO3)4, exhibit simultaneous antiferromagnetic and ferroelectric order, and strong coupling is indicated by the magnetic field dependence of the electric polarization. In order to shed light on the multiferroic mechanism in RFe3(BO3)4, x-ray scattering studies were carried out. A combination of resonant— at the rare earth L edges— and nonresonant magnetic x-ray scattering allows the behaviors of the rare earth and iron magnetic subsystems to be unraveled. For R = Gd and Nd, both commensurate and incommensurate magnetic phases are observed, and there is a correlation between the magnetic field-induced destruction of the incommensurate magnetic phases and the onset of electric polarization. In substituted ferroborates with rare earth species having different anisotropies, a decoupling between the rare earth subsystems is observed.
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