Abstract
We observed antiferromagnetic magnons in manganese oxide (MnO) using terahertz time-domain spectroscopy (THz-TDS). The antiferromagnetic resonance (AFMR) frequency shows the behavior of a first-order phase transition near the Neel temperature (116 K). The temperature dependence of the AFMR frequency is explained well by a molecular field approximation including biquadratic exchange. It was found that the relaxation rate of the AFMR signal shows an abrupt increase near the Neel temperature, where the antiferromagnetic long-range order disappears. The change \(\Delta n\) in refractive index was obtained from the peak shift in the THz electric field. The temperature dependence of \(\Delta n\) can be explained by the lattice and magnetostrictive contributions to this refractive index change. The measurement of refractive index by THz-TDS is very useful for optically opaque materials such as MnO.
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