Abstract
Multiferroic materials in which ferroelectricity is induced by magnetic ordering have been intensively investigated in the past decade. We performed magnetic and crystal structural studies on the typical multiferroic materials, MnWO4 and RMnO3（R＝Dy or Tb）and established that the spin supercurrent or the inverse effect of the Dzyaloshinskii-Moriya interaction is the origin of ferroelectricity in these materials by means of spin polarized neutron scattering and circularly-polarized X-ray diffraction. It is also shown that magnetic moments of rare-earth ions play an important role in incomprehensible electromagnetic effects in RMnO3.
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