Journal
PHYSICAL REVIEW B
Volume 79, Issue 13, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.134425
Keywords
antiferromagnetic materials; bismuth compounds; crystal field interactions; ferrites; ferroelectric materials; magnetic domains; magnetic transitions; magneto-optical effects; magnons; multiferroics; spin dynamics
Funding
- DOE [DE-FG02-01ER45885]
- NSF [DMR-0080008, DMR-0654118, DMR-0820404, DMR-0507146]
- R.O.C [97-3114-M-009-001]
- State of Florida (NHMFL)
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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.
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