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Role of Spin-spiral Period for Anomalous Magnetic-Field-Induced Spectral Variation of Electromagnon Resonance in Multiferroic Ba2Mg2Fe12O22

We investigate the spectral variation of electromagnon resonance in magnetic field, which causes the giant magnetochromism in terahertz region, in a spin-spiral multiferroic hexaferrite Ba2Mg2Fe12O22 in terms of the timedomain terahertz spectroscopy. The magnetic-field-induced successive phase transitions among the spin-spiral orders, which are characterized by the change of spin-spiral period, are found to cause the large discontinuous energy shift and the steep changes of spectral weight of electromagnon. These clear correlations manifest the important role of the spinspiral period for the terahertz optical response of electromagnon in the multiferroic hexaferrite.