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Research Highlight | Materials Science Division

Dynamical magnetoelectric effect at THz frequencies in a multiferroic hexaferrite

In a study published in Physical Review Letters, researchers indicated the calculated frequency shift points to the key role of the Dzyaloshinskii-Moriya interaction that is altered by static electric polarization change under different magnetic field.

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.
  • 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.

DOI10.1103/PhysRevLett.120.027202

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