Spin canting in nonlinear terahertz magnon dynamics revealed by magnetorefractive probing in orthoferrite

Abstract

We excite the spin precession in rare-earth orthoferrite YFeO3 by the magnetic field of intense terahertz pulse and probe its dynamics by transient absorption change in the near infrared. The observed waveforms contain quasi-ferromagnetic-mode magnon oscillation and its second harmonics with a comparably strong amplitude. The result can be explained by dielectric function derived from magnetorefractive Hamiltonian. We reveal that the strong second harmonic signal microscopically originates from novel dynamics of the quasi-ferromagnetic mode magnon at nonlinear regime, wherein spin canting angle periodically oscillates.

Main text: 11 pages including abstract, 4 figures and reference list. Supplemental Material: 11 pages including 4 figures and reference list

References in corpus (3)

• Temporal and spectral fingerprints of ultrafast all-coherent spin switching
• Non-perturbative Interband Response of InSb Driven Off-resonantly by Few-cycle Electromagnetic Transients
• Theoretically predicted picosecond optical switching of spin chirality in multiferroics

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