Abstract
The dynamically resolved response of the canted-antiferromagnet FeBO3 excited near a magnon resonance shows fast oscillations after THz-excitation’ followed by the magnons’ intrinsic relaxation’ enabling to probe transient magnetic relaxation dynamics over large frequency range.
Highlights
The ranges used for the scans varied from 70 ps with 20 fs step size to resolve fast oscillations up to 1 ns with 1 ps step size for resolving the slow ones
At 0.38 THz frequency, the refractive index is located between 1.50 and 2.96, while the absorption coefficient lies between 173 cm-1 and 597 cm-1
The response of the sample when the external continuous magnetic field and the THz magnetic field are parallel to each other was not measurable, whereas a strong signal is clearly observed with orthogonal magnetic fields
Summary
The electric field of the THz pulses was measured by electro-optic sampling in ZnTe; the spectrum extends up to 1.5 THz. This THz spectrum is able to excite the magnon frequency of the antiferromagnetic mode. The sample is a thin FeBO3 crystal (50 μm at the periphery - 200 μm in the center, measured with an optical microscope) placed in a DC magnetic field (BDC on Fig. 1(a)) perpendicular to the magnetic field of the THz pulses (BTHz on Fig. 1(a)). We first characterized the transmission of the FeBO3 samples in a commercial timedomain spectrometer for THz, in absence of an external magnetic field.
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