This study investigates time-resolved magneto-optical effects in the antiferromagnetic semiconductor α-MnTe, focusing on ultrafast spin dynamics in epitaxial MnTe(001)/InP(111) thin films using pump-probe magneto-optical measurements in the Kerr configuration. The researchers observed oscillation modes at 55 GHz that are not present at zero magnetic field, which they identify as magnons likely originating from inverse stimulated Raman scattering. These oscillations persist up to 335 K, suggesting coupling to short-range magnetic order in MnTe above its Néel temperature of 310 K. Additionally, two optical phonon modes at 3.6 THz and 4.2 THz were observed, which broaden and redshift with increasing temperature. The study also explores the temperature dependence of these phonons, finding that their linewidths, frequencies, and lifetimes change with temperature, consistent with previous Raman studies. The results suggest that the observed oscillations are due to optical phonons, not magnons, as the phonon modes show no field dependence within experimental resolution. The oscillations are also found to be non-thermal in origin, possibly due to impulsive stimulated Raman scattering or displacive excitation of coherent phonons. The study highlights the unique magnetic properties of α-MnTe, which is an alternagnet with anisotropic spin polarization that alternates sign in momentum space. This alternation leads to new effects such as the anomalous Hall effect and magneto-optical Kerr effect, which have potential applications in spintronic and alternagnetic devices. The findings provide new insights into the magnetic behavior of α-MnTe and its potential for future applications in spintronics and magnonics. The results demonstrate the importance of experimental studies of magnetism in MnTe for better understanding of its unique magnetic phase.This study investigates time-resolved magneto-optical effects in the antiferromagnetic semiconductor α-MnTe, focusing on ultrafast spin dynamics in epitaxial MnTe(001)/InP(111) thin films using pump-probe magneto-optical measurements in the Kerr configuration. The researchers observed oscillation modes at 55 GHz that are not present at zero magnetic field, which they identify as magnons likely originating from inverse stimulated Raman scattering. These oscillations persist up to 335 K, suggesting coupling to short-range magnetic order in MnTe above its Néel temperature of 310 K. Additionally, two optical phonon modes at 3.6 THz and 4.2 THz were observed, which broaden and redshift with increasing temperature. The study also explores the temperature dependence of these phonons, finding that their linewidths, frequencies, and lifetimes change with temperature, consistent with previous Raman studies. The results suggest that the observed oscillations are due to optical phonons, not magnons, as the phonon modes show no field dependence within experimental resolution. The oscillations are also found to be non-thermal in origin, possibly due to impulsive stimulated Raman scattering or displacive excitation of coherent phonons. The study highlights the unique magnetic properties of α-MnTe, which is an alternagnet with anisotropic spin polarization that alternates sign in momentum space. This alternation leads to new effects such as the anomalous Hall effect and magneto-optical Kerr effect, which have potential applications in spintronic and alternagnetic devices. The findings provide new insights into the magnetic behavior of α-MnTe and its potential for future applications in spintronics and magnonics. The results demonstrate the importance of experimental studies of magnetism in MnTe for better understanding of its unique magnetic phase.