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

Article

关键词: PULSES;    ANTIFERROMAGNETS;    MAGNETOOPTICS;    MAGNETIZATION;    MAGNETISM;    FIELDS;    YFEO3;    FILMS;    ION;   

DOI  :  10.1103/PhysRevB.90.184405

来源: SCIE

【 摘 要 】

Using the examples of laser-induced spin-reorientation phase transitions in TmFeO3 and ErFeO3 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 similar to 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 (6)A(1) ground state of the Fe+3 ions occupying rare-earth positions.

【 授权许可】

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