Keita Yamaguchi, Takayuki Kurihara, Yasuo Minami, Makoto Nakajima, and Tohru Suemoto
http://prl.aps.org/accepted/d9079Y6aL021383505904b01afde0a566f9574092
Terahertz time domain spectroscopy was performed on orthoferrite ErFeO3. Through the emission from the two magnetic resonance modes, we succeeded in observing the spin reorientation transition. Depending on the orientation of the single crystal, the reorientation can be either detected as mode switching between the two modes or polarization change of the emission. This method enables picosecond resolved observation of the reorientation without disturbances such as electronic excitation and heating, and is expected to open the doorway to observe ultrafast reorientation with terahertz pulse
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