Ultrafast Light-driven Simultaneous Excitation of Coherent Terahertz Magnons and Phonons in Multiferroic BiFeO${}_3$

Abstract

The ultrafast switching of magnetization in multiferroic materials by a femtosecond laser could provide various advantages in photonics and magnonics. An efficient approach to control the light matter interaction is the modulation of ultrafast coherent magnons and phonons in the high frequency range. Spontaneous Raman and infrared spectra reveal the excitation of magnons and optical phonons in multiferroic BiFeO3 in the sub few terahertz range. However, coherent control of such quasiparticles has not been achieved yet. In this study, we demonstrate that linearly polarized laser pulses simultaneously excite coherent magnons out of plane and in plane cyclone modes and optical phonon E mode in BiFeO3. Experimental results in conjugation with phenomenological theory, by considering three uniformly distributed magnetic domains reveal that impulsive stimulated Raman scattering is responsible for the generation of coherent magnons and phonons in BiFeO3. The observation of these terahertz magnon and optical phonon modes paves the way for the development of ultrafast magneto electro optical devices.

arXiv comment36 pages, 11 fihures, 7 tables

References in corpus (21)

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Cited by in corpus (11)

• Extreme Terahertz Magnon Multiplication Induced by Resonant Magnetic Pulse Pairs
• Sum-frequency excitation of coherent magnons
• Efficient spin excitation via ultrafast damping-like torques in antiferromagnets
• Selective imaging of terahertz electric field of phonon-polariton in LiNbO${}_3$
• Photocontrol of spin scalar chirality in centrosymmetric itinerant magnets
• Heisenberg representation of nonthermal ultrafast laser excitation of magnetic precessions
• Creation and control of valley currents in graphene by few cycle light pulses
• Sub-millimeter propagation of antiferromagnetic magnons via magnon-photon coupling
• Hybridization of terahertz phonons and magnons in disparate and spatially-separated material specimens
• Observation of quasi-elastic light scattering in BiFeO${}_3$
• Flipping of electronic spins in BiFeO${}_3$ via chiral $d-d$ excitations