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Effects of temperature (6--225 K) and magnetic field (0--7 T) on thelow-energy (1.2--5 meV) electrodynamics of the electromagnon, the magneticresonance driven by the light electric field, have been investigated for ahexaferrite magnet Ba$_2$Mg$_2$Fe$_{12}$O$_{22}$ by using terahertz time-domainspectroscopy. We find the gigantic terahertz magnetochromism viaelectromagnons; the magnetochromic change, as defined by the difference of theabsorption intensity with and without magnetic field, exceeds 500% even at 0.6T. The results arise from the fact that the spectral intensity of theelectromagnon critically depends on the magnetic structure. With changing theconical spin structures in terms of the conical angle $\theta$ from the properscrew ($\theta=0^\circ$) to the ferrimagnetic ($\theta=90^\circ$) through theconical spin-ordered phases ($0^\circ<\theta<90^\circ$) by external magneticfields, we identify the maximal magnetochromism around $\theta\approx45^\circ$.On the contrary, there is no remarkable signature of the electromagnon in theproper screw and spin-collinear (ferrimagnetic) phases, clearly indicating theimportant role of the conical spin order to produce themagnetically-controllable electromagnons. The possible origin of thiselectromagnon is argued in terms of the exchange-striction mechanism.

Gigantic terahertz magnetochromism via electromagnons in hexaferrite magnet Ba$_2$Mg$_2$Fe$_{12}$O$_{22}$