Terahertz spin, phonon, and hybridized spin-phonon excitations in Co4Ta2O9

Terahertz spin wave-based computation necessitates the expansion of magnonic based material base, preferably the non-collinear antiferromagnetic spin-configured systems. Using magneto-terahertz time-domain spectroscopy, we revealed a wide range of low-energy antiferromagnetic resonances in a honeycomb magnet Co4Ta2O9, including magnons, phonons, and hybridized spin-phonon coupled modes.