Coherent magnon and acoustic phonon dynamics in tetragonal and rare-earth-doped BiFeO3 multiferroic thin films
| Autor: | R. A. Synowicki, Neil McN. Alford, James Lloyd-Hughes, V. R. Palkar, Anna-Karin Axelsson, R. D. Johnson, Frederic Aguesse, S. P. P. Jones, K. I. Doig, S. Nawaz |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Condensed matter physics Phonon Magnon Doping Temperature Condensed Matter Physics Electronic Optical and Magnetic Materials Condensed Matter::Materials Science Magnetization Tetragonal crystal system Condensed Matter::Superconductivity Excited state Condensed Matter::Strongly Correlated Electrons Multiferroics Thin film Bismuth Ferrite La Spin-Waves Spectroscopy |
| Popis: | Coherent magnons and acoustic phonons were impulsively excited and probed in thin films of the room temperature multiferroic Bi${}_{1\ensuremath{-}x\ensuremath{-}y}$Dy${}_{x}$La${}_{y}$FeO${}_{3}$ using femtosecond laser pulses. The elastic moduli of rhombohedral, tetragonal, and rare-earth doped BiFeO${}_{3}$ were determined from acoustic-mode frequencies in conjunction with spectroscopic ellipsometry. A weak ferromagnetic order, induced alternately by magnetization in the growth direction or by tetragonality, created a magnon oscillation at 75 GHz, indicative of a Dzyaloshinskii-Moriya interaction energy of 0.31 meV. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|