Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 74, Issue 5, Pages 1419-1422Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.74.1419
Keywords
ferrimagnet; multiferroics; magnetoelectric effect; ferrotoroidic; toroidal moment magnetic X-ray scattering; resonant X-ray scattering; magnetoelectric X-ray scattering; X-ray spectroscopy; nonreciprocal directional dichroism
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We report on the first observation of magnetoelectric X-ray scattering (MEXS), i.e., incident-k-direction-dependent scattering, for a polar ferrimagnet GaFeO3. Near the K edge of Fe, the magnetic component of the (040) X-ray reflection shows a larger enhancement than that of the (020) X-ray reflection, which cannot be attributed to the genuine magnetic scattering, but to the MEXS of Fe3+ ions. Toroidal moments as defined by the Outer product of the Fe off-center displacement and the magnetic moment show ferroic ordering, which causes the resonant MEXS at the Fe 1s-3d excitation energy.
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