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Ferromagnetic-type order of atomic multipoles in the polar ferrimagnetic GaFeO_{3}

DOI: 10.1103/PhysRevB.85.144421 DOI Help

Authors: U. Staub (Swiss Light Source, Paul Scherrer Institut) , C. Piamonteze (Swiss Light Source, Paul Scherrer Institut) , M. Garganourakis (Swiss Light Source, Paul Scherrer Institut) , S. Collins (Diamond Light Source) , S. Koohpayeh (Department of Metallurgy and Materials, University of Birmingham) , D. Fort (Department of Metallurgy and Materials, University of Birmingham) , S. Lovesey (Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 85 (14)

State: Published (Approved)
Published: April 2012

Abstract: Resonant x-ray Bragg diffraction by gallium ferrate (GaFeO3) at Friedel pairs of charge allowed reflections in the vicinity of the Fe K edge are presented. By use of the magnetization difference, the interference of charge diffraction with the magnetic diffraction is extracted. The study of Friedel pairs and concentrating at the pre-edge allows us to extract the effect of inversion symmetry breaking on the magnetic Fe 3d shell. The data are analyzed using a model based on atomic multipole moments which are magnetic and have no space inversion symmetry (magnetoelectric) interfering with the charge scattering. This model successfully describes data as a function of azimuthal angle and for different incident polarization and it shows that data can be directly related to the magnetoelectric dipole (toroidal) and quadrupole moments. Though the model describes most of the observations successfully, how to correctly describe the observed magnetic nonresonant intensity below the edge remains an open question.

Journal Keywords: Resonant Multipoles; Polar Ferrimagnet

Subject Areas: Physics, Materials

Instruments: I16-Materials and Magnetism

Other Facilities: No

Added On: 29/09/2012 13:02

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