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Magnetic field and temperature dependence of spin wave excitation and manipulation in RFeO3 (R=Nd) are studied with THz time-domain spectroscopy. Our studies reveal that the spin reorientation transition triggered by external magnetic field is strongly anisotropic: magnetic fields along a-axis is much easier to switch the spin alignment than that along c-axis in NdFeO3 crystal.
Temperature dependence of FID signal emitted by AFM in NdFeO3 is investigated by employing THz time-domain spectroscopy. Our results reveal that Γ4→Γ24 phase transition occurs around T1=170 K, and both two phases have the same AFM resonant frequency of 0.485 THz. The frequency softening is observed for Γ24→Γ2 occurring around T2=110 K.
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