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

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<mark>Journal publication date</mark>5/11/2014
<mark>Journal</mark>Physical review B
Issue number18
Volume90
<mark>State</mark>Published
<mark>Original language</mark>English

Abstract

Using the examples of laser-induced spin-reorientation phase transitions in
TmFeO
3
and
ErFeO
3
orthoferrites, 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
Fe
3
+
ions. We suggest that it can be assigned to transitions between the multiplet sublevels of the
6
A
1
ground state of the
Fe
+
3
ions occupying rare-earth positions.