Abstract

Terahertz (THz) time domain spectroscopy (THz-TDS) of a CoCr 2 O 4 and ZnCr 2 Se 4 single crystals have been performed under magnetic fields up to 10 Tesla and low temperatures. We observed the magnetic resonances originated from the spin dynamics of inter-sublattice exchange and screw spin structure in THz frequency region, which show pronouncedly anisotropic effect. The phase and polarization sensitive detection in THz-TDS allow us to reveal the large circular absorption dichroism and Faraday rotations under magnetic field in these materials.

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