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Terahertz emission spectroscopy of laser-induced spin dynamics in TmFeO3 and ErFeO3 orthoferrites

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Article number184405
<mark>Journal publication date</mark>5/11/2014
<mark>Journal</mark>Physical review B
Issue number18
Number of pages8
Publication StatusPublished
<mark>Original language</mark>English


Using the examples of laser-induced spin-reorientation phase transitions in TmFeO3 and ErFeOorthoferrites, we demonstrate that terahertz emission spectroscopy can obtain novel information about ultrafast laser-induced spin dynamics, which is not accessible by more common all-optical methods. The power of the method is evidenced by the fact that, in addition to the expected quasi-ferromagnetic and quasi-antiferromagnetic modes of the iron sublattices, terahertz emission spectroscopy enables detection of a resonance optically excited at an unexpected frequency of ∼0.3–0.35 THz. By recording how the amplitude and phase of the excited oscillations depend on temperature and applied magnetic field, we show that the unexpected mode has all the features of a spin resonance of the Fe3+ ions. We suggest that it can be assigned to transitions between the multiplet sublevels of the 6Aground state of the Fe+3 ions occupying rare-earth positions.