μ⃗S (blue arrow) and μ⃗L (red arrow). Blue and red ellipsoids represent trajectories of the moment modulations. θ and ϕ refer to the angles of μ⃗S from [001] and μ⃗L from [120], respectively.
Scientific Achievement
Using single crystals of a carbon dioxide Z‑type hexaferrite, we identified and modeled a time-domain terahertz (THz) electromagnon emerging in coincidence with transverse conical magnetic order.
Significance and Impact
Our work provides both an experimental realization as well as a mechanism and quantitative model of the dynamical magnetoelectric effect in a large class of multiferroics, delivering a potential materials platform for THz devices operating at room temperature.
Research Details
- Anisotropy of dielectric susceptibility accessible in single crystals allows unambiguous assignment of the electromagnon as coupling to transverse conical magnetic order.
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Quantitative treatment of the magnetic field-dependence of the electromagnon resonance frequency developed based on the Dzyaloshinskii-Moriya interaction as the underlying mechanism for magnetochromism.
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