Field dependence of magnetic correlations through the polarization flop transition in multiferroic TbMnO3 : evidence for a magnetic memory effect

Abstract

The field-induced multiferroic transition in TbMnO3 has been studied by neutron scattering. Apart strong hysteresis, the magnetic transition associated with the flop of electronic polarization exhibits a memory effect: after a field sweep, TbMnO3 does not exhibit the same phase as that obtained by zero-field cooling. The strong changes in the magnetic excitations across the transition perfectly agree with a rotation of the cycloidal spiral plane indicating that the inverse Dzyaloshinski-Moriya coupling causes the giant magnetoelectric effect at the field-induced transition. The analysis of the zone-center magnetic excitations identifies the electromagnon of the multiferroic high-field phase.

4 pages, 4 figures

References in corpus (6)

• Spin current and magneto-electric effect in non-collinear magnets
• Role of the Dzyaloshinskii-Moriya interaction in multiferroic perovskites
• Ferroelectric polarization flop in a frustrated magnet MnWO${}_4$ induced by magnetic fields
• Dynamical magneto-electric coupling in helical magnets
• A New Multiferroic Material: MnWO4
• New features in the phase diagram of TbMnO${}_3$

Cited by in corpus (6)

• Origin of electromagnon excitations in \textit{R}MnO${}_3$
• Terahertz time-domain spectroscopy of electromagnons in multiferroic perovskite manganites
• Magnetic and magnetoelectric excitations in TbMnO${}_3$
• Electric-dipole active two-magnon excitation in {\textit{ab}} spiral spin phase of a ferroelectric magnet Gd${}_{\text{0.7}}$Tb${}_{\text{0.3}}$MnO${}_{\text{3}}$
• Magnetic order and electromagnon excitations in DyMnO3 studied by neutron scattering experiments
• Spin-wave dispersion and magnon chirality in multiferroic TbMnO3