Electric-dipole-active magnetic resonance in the conical-spin magnet Ba2 Mg2 Fe12 O22

N. Kida, D. Okuyama, S. Ishiwata, Y. Taguchi, R. Shimano, Kazuaki Iwasa, T. Arima, Y. Tokura

Research output: Contribution to journalArticlepeer-review

52 Citations (Scopus)

Abstract

Electric-field (E) drive of magnetic resonance in a solid has been a big challenge in condensed-matter physics and emerging spintronics. We demonstrate the appearance of distinct magnetic excitations driven by the light E component in a hexaferrite Ba2 Mg2 Fe12 O22. In the conical-spin state even with no spontaneous electric polarization (Ps), a sharp and intense resonance is observed around 2.8 meV for the light E vector parallel to the magnetic propagation vector in accord with the inelastic neutron scattering spectrum at the magnetic zone center. As the generic characteristic of the conical state, a weak magnetic field (∼2kOe) can modify the spin structure, leading to a remarkable change (terahertz magnetochromism) in spectral shape and intensity (by ∼200%) of the electric-dipole-active magnetic resonance. The present observation implies that potentially many magnets with noncollinearly ordered spins may host such an electric-dipole-active resonance, irrespective of the presence or absence of Ps.

Original languageEnglish
Article number220406
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume80
Issue number22
DOIs
Publication statusPublished - 2009 Dec 10
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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