Multiferroics, the materials in which both (anti)ferromagnetism and ferroelectricity can coexist, are the prospective host of the gigantic magnetoelectric (ME) effect. The multiferroics based on the spin-current (or inverse Dzyaloshinskiy-Moriya interaction) mechanism have recently been proved to realize in many cycloidal and conical spin states of frustrated magnets, in which the clamping between the magnetic and ferroelectric domains can show up. Recent advance in the research on the dynamical ME effects toward the electrical control of magnetism is presented.
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