2009/04/21 by Xiaoshan Xu, Tatiana V. Brinzari, S. Lee +9 · 1 citation
Engineering · Materials Science · #Magnetic and transport properties of perovskites and related materials #Magneto-Optical Properties and Applications #Multiferroics and related materials
paper · doi:10.1103/physrevb.79.134425
openalex publication_date 2009/04/21 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
In order to investigate spin-charge coupling in multiferroic oxides, we measured the optical properties of BiFeO3. Although the direct 300 K charge gap is observed at 2.67 eV, absorption onset actually occurs at much lower energy with Fe3+ excitations at 1.41 and 1.90 eV. Temperature and magnetic-field-induced spectral changes reveal complex interactions between on-site crystal-field and magnetic excitations in the form of magnon sidebands. We employ the sensitivity of these magnon sidebands to map out the magnetic-field-temperature phase diagram which demonstrates optical evidence for spin spiral quenching above 20 T and suggests a spin domain reorientation near 10 T.