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Electromagnons are known from multiferroics as spin waves excited by theelectric component of electromagnetic radiation. We report the discovery of anexcitation in the far-infrared spectra of eps-Fe2O3 which we attribute to anelectromagnon appearing below 110 K, where the ferrimagnetic structure becomesincommensurately modulated. Inelastic neutron scattering shows that theelectromagnon energy corresponds to that of a magnon from the Brillouin zoneboundary. Dielectric measurements did not reveal any sign of ferroelectricityin eps-Fe2O3 down to 10 K, despite its acentric crystal structure. This showsthat the activation of an electromagnon requires, in addition to the polarferrimagnetic structure, a modulation of the magnetic structure. We demonstratethat a combination of inelastic neutron scattering with infrared and / orterahertz spectroscopies allows detecting electromagnons in ceramics, where nocrystal-orientation analysis of THz and infrared spectra is possible.

Electromagnon in ferrimagnetic eps-Fe2O3 nanograin ceramics