Terahertz spectroscopy of spin waves in multiferroic BiFeO${}_3$ in high magnetic fields

Abstract

We have studied the magnetic field dependence of far-infrared active magnetic modes in a single ferroelectric domain \BFO/ crystal at low temperature. The modes soften close to the critical field of 18.8\,T along the [001] (pseudocubic) axis, where the cycloidal structure changes to the homogeneous canted antiferromagnetic state and a new strong mode with linear field dependence appears that persists at least up to 31\,T. A microscopic model that includes two \DM/ interactions and easy-axis anisotropy describes closely both the zero-field spectroscopic modes as well as their splitting and evolution in a magnetic field. The good agreement of theory with experiment suggests that the proposed model provides the foundation for future technological applications of this multiferroic material.

Added Randy S. Fishman to the author list, he contributed the theory

References in corpus (11)

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Cited by in corpus (25)

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• Driving spin excitations by hydrostatic pressure in BiFeO3
• Origin of the giant linear magnetoelectric effect in perovskite-like multiferroic BiFeO${}_3$
• Spin and lattice excitations of a BiFeO3 thin film and ceramics
• Field dependence of the Spin State and Spectroscopic Modes of Multiferroic BiFeO${}_3$
• Electromagnon in Y-type hexaferrite BaSrCoZnFe${}_{11}$AlO${}_{22}$
• Ultrafast Light-driven Simultaneous Excitation of Coherent Terahertz Magnons and Phonons in Multiferroic BiFeO${}_3$
• Spin-Induced Polarizations and Non-Reciprocal Directional Dichroism of Multiferroic BiFeO${}_3$
• Ultrafast demagnetization in ferromagnetic materials: Origins and progress
• Surface acoustic wave coupled to magnetic resonance on a multiferroic CuB${}_2$O${}_4$
• Magnetic field control of cycloidal domains and electric polarization in multiferroic BiFeO${}_3$
• The Microscopic Model of BiFeO${}_3$
• Normal Modes of a Spin Cycloid or Helix
• Terahertz frequency magnetoelectric effect in Ni doped CaBaCo${}_4$O${}_7$
• Spin-current driven Dzyaloshinskii-Moriya interaction in the multiferroic BiFeO3 from first-principles
• The Magnetoelastic Distortion of Multiferroic BiFeO${}_3$ in the Canted Antiferromagnetic State
• Pinning, Rotation, and Metastability of BiFeO${}_3$ Cycloidal Domains in a Magnetic Field
• Exceptional field dependence of antiferromagnetic magnons in LiFePO${}_4$
• Selection rules and dynamic magnetoelectric effect of the spin waves in multiferroic BiFeO${}_3$
• Orientation Dependence of the Critical Magnetic Field for Multiferroic BiFeO${}_3$
• Size-dependent bistability in multiferroic nanoparticles
• Observation of quasi-elastic light scattering in BiFeO${}_3$