We present the magnetic dipole transition at 0.299 THz excited by magnetic component of terahertz electromagnetic pulse in an antiferromagnetic YFeO 3 crystal. The impulsive magnetic field of the terahertz pulse tilts the macroscopic magnetization, causing deviation from the equilibrium position, which is manifested by a sharp absorption at the frequency of the quasiferromagnetic mode of the crystal. The rotating coherent macroscopic magnetization radiates elliptically polarized emission at the frequency of the quasiferromagnetic resonance due to the dichroic absorption in the crystal.
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Terahertz magnetic field induced coherent spin precession in YFeO 3
Zhou, Runze; Jin, Zuanming; Li, Gaofang; Ma, Guohong; Cheng, Zhenxiang; Wang, Xiaolin
Follow Applied Physics Letters
, Volume 100 (6)
American Institute of Physics – Feb 6, 2012
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