Electrically driven spin excitation in a ferroelectric magnet DyMnO_3

Details Electrically driven spin excitation in a ferroelectric magnet DyMnO_3 Electrically driven spin excitation in a ferroelectric magnet DyMnO_3

2007-11-17

arxiv.org/abs/0711.2733v2

Phy. Rev. B 78, 104414 (2008)

Physics

Condensed Matter

Materials Science

New version, 11 pages including colored 8 figures

Scientific paper

10.1103/PhysRevB.78.104414

Temperature (5--250 K) and magnetic field (0--70 kOe) variations of the low-energy (1--10 meV) electrodynamics of spin excitations have been investigated for a complete set of light-polarization configurations for a ferroelectric magnet DyMnO$_3$ by using terahertz time-domain spectroscopy. We identify the pronounced absorption continuum (1--8 meV) with a peak feature around 2 meV, which is electric-dipole active only for the light $E$-vector along the a-axis. This absorption band grows in intensity with lowering temperature from the spin-collinear paraelectric phase above the ferroelectric transition, but is independent of the orientation of spiral spin plane ($bc$ or $ab$), as shown on the original $P_{\rm s}$ (ferroelectric polarization) $\parallel c$ phase as well as the magnetic field induced $P_{\rm s}\parallel a$ phase. The possible origin of this electric-dipole active band is argued in terms of the large fluctuations of spins and spin-current.

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