TY - JOUR
AU - X.S Xu
AU - T.V Brinzari
AU - Sang Hoon Lee
AU - Y.H Chu
AU - L.W Martin
AU - A Kumar
AU - S McGill
AU - R.C Rai
AU - Ramamoorthy Ramesh
AU - V Gopalan
AU - S.W Cheong
AU - J.L Musfeldt
AB - 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. © 2009 The American Physical Society.
BT - Physical Review B - Condensed Matter and Materials Physics
DO - 10.1103/PhysRevB.79.134425
LA - eng
M1 - 13
N1 - cited By 119
N2 - 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. © 2009 The American Physical Society.
PY - 2009
T2 - Physical Review B - Condensed Matter and Materials Physics
TI - Optical properties and magnetochromism in multiferroic BiFeO3
VL - 79
SN - 10980121
ER -